diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 378a9f12..02743ea9 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -19,12 +19,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # Root-only test groups. The lib/* sublibraries (DataDrivenDMD, DataDrivenSR,
+        # DataDrivenSparse, DataDrivenLux) are covered by SublibraryCI.yml via the
+        # project model and must not be double-tested through the root matrix.
         group:
           - Core
-          - DataDrivenDMD
-          - DataDrivenSR
-          - DataDrivenSparse
-          - DataDrivenLux
           - nopre
         version:
           - '1'
@@ -37,5 +36,5 @@ jobs:
     with:
       julia-version: "${{ matrix.version }}"
       group: "${{ matrix.group }}"
-      coverage-directories: "src,lib/DataDrivenDMD/src,lib/DataDrivenSparse/src,lib/DataDrivenSR/src,lib/DataDrivenLux/src"
+      coverage-directories: "src"
     secrets: "inherit"
diff --git a/.github/workflows/Downgrade.yml b/.github/workflows/Downgrade.yml
index 60a30367..514f6061 100644
--- a/.github/workflows/Downgrade.yml
+++ b/.github/workflows/Downgrade.yml
@@ -10,11 +10,13 @@ on:
       - master
     paths-ignore:
       - 'docs/**'
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 jobs:
   test:
     name: "Downgrade"
     uses: "SciML/.github/.github/workflows/downgrade.yml@v1"
     with:
-      julia-version: "1.10"
-      skip: "Pkg,TOML"
+      group: "Core"
     secrets: "inherit"
diff --git a/.github/workflows/DowngradeSublibraries.yml b/.github/workflows/DowngradeSublibraries.yml
index 6fba9003..abe9f107 100644
--- a/.github/workflows/DowngradeSublibraries.yml
+++ b/.github/workflows/DowngradeSublibraries.yml
@@ -19,4 +19,6 @@ jobs:
     secrets: "inherit"
     with:
       julia-version: "lts"
-      skip: "Pkg,TOML,Statistics,LinearAlgebra,SparseArrays,InteractiveUtils,Random,Test,DataDrivenDiffEq"
+      group-env-name: "DATADRIVENDIFFEQ_TEST_GROUP"
+      group-env-value: "Core"
+      # Every lib/* sublibrary is downgrade-tested (projects auto-discovered, no exclusions).
diff --git a/.github/workflows/Downstream.yml b/.github/workflows/Downstream.yml
new file mode 100644
index 00000000..8542fadf
--- /dev/null
+++ b/.github/workflows/Downstream.yml
@@ -0,0 +1,62 @@
+name: IntegrationTest
+on:
+  push:
+    branches: [master]
+    tags: [v*]
+  pull_request:
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+jobs:
+  test:
+    name: ${{ matrix.package.repo }}/${{ matrix.package.group }}/${{ matrix.julia-version }}
+    runs-on: ${{ matrix.os }}
+    env:
+      GROUP: ${{ matrix.package.group }}
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version: ['1.10']
+        os: [ubuntu-latest]
+        package:
+          - {user: SciML, repo: SymbolicNumericIntegration.jl, group: All}
+          - {user: ODINN-SciML, repo: ODINN.jl, group: Core1}
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: julia-actions/setup-julia@v3
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: x64
+      - name: Clone Downstream
+        uses: actions/checkout@v6
+        with:
+          repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+          path: downstream
+      - name: Load this and run the downstream tests
+        shell: julia --color=yes --project=downstream {0}
+        run: |
+          using Pkg
+          try
+            # Develop the root umbrella DataDrivenDiffEq plus every lib/* sublibrary
+            # so the downstream tests run against this checkout rather than releases.
+            Pkg.develop(PackageSpec(path="."));
+            Pkg.develop(map(path ->Pkg.PackageSpec.(;path="lib/$(path)"), readdir("./lib")));
+            Pkg.test(coverage=true)  # resolver may fail with test time deps
+          catch err
+            err isa Pkg.Resolve.ResolverError || rethrow()
+            # If we can't resolve that means this is incompatible by SemVer and this is fine
+            # It means we marked this as a breaking change, so we don't need to worry about
+            # mistakenly introducing a breaking change, as we have intentionally made one
+            @info "Not compatible with this release. No problem." exception=err
+            exit(0)  # Exit immediately, as a success
+          end
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: lcov.info
+          fail_ci_if_error: false
+          disable_safe_directory: true
diff --git a/.github/workflows/SublibraryCI.yml b/.github/workflows/SublibraryCI.yml
index 6cec66bb..3a6d609f 100644
--- a/.github/workflows/SublibraryCI.yml
+++ b/.github/workflows/SublibraryCI.yml
@@ -19,4 +19,7 @@ concurrency:
 jobs:
   sublibraries:
     uses: "SciML/.github/.github/workflows/sublibrary-project-tests.yml@v1"
+    with:
+      group-env-name: DATADRIVENDIFFEQ_TEST_GROUP
+      check-bounds: auto
     secrets: "inherit"
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
index f49313b6..576699a6 100644
--- a/.github/workflows/TagBot.yml
+++ b/.github/workflows/TagBot.yml
@@ -1,15 +1,22 @@
-name: TagBot
+name: "TagBot"
 on:
   issue_comment:
-    types:
-      - created
+    types: [created]
   workflow_dispatch:
 jobs:
-  TagBot:
-    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: JuliaRegistries/TagBot@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          ssh: ${{ secrets.DOCUMENTER_KEY }}
+  tagbot:
+    uses: "SciML/.github/.github/workflows/tagbot.yml@v1"
+    secrets: "inherit"
+  tagbot-subpackages:
+    strategy:
+      fail-fast: false
+      matrix:
+        subdir:
+          - "lib/DataDrivenDMD"
+          - "lib/DataDrivenLux"
+          - "lib/DataDrivenSparse"
+          - "lib/DataDrivenSR"
+    uses: "SciML/.github/.github/workflows/tagbot.yml@v1"
+    with:
+      subdir: "${{ matrix.subdir }}"
+    secrets: "inherit"
diff --git a/LICENSE b/LICENSE.md
similarity index 100%
rename from LICENSE
rename to LICENSE.md
diff --git a/Project.toml b/Project.toml
index c9178645..19fb0149 100644
--- a/Project.toml
+++ b/Project.toml
@@ -31,15 +31,19 @@ CommonSolve = "0.2"
 DataInterpolations = "4, 5, 6, 7, 8"
 DiffEqBase = "6.211, 7"
 DocStringExtensions = "0.7, 0.8, 0.9"
+LinearAlgebra = "1"
 MLUtils = "0.3, 0.4"
 ModelingToolkit = "11.21.0"
 OrdinaryDiffEqTsit5 = "1, 2"
 Parameters = "0.12.1"
+Pkg = "1"
 PrecompileTools = "1"
 ProgressMeter = "1.6"
 QuadGK = "2.4"
+Random = "1"
 RecipesBase = "1"
 Reexport = "1.0"
+SafeTestsets = "0.1"
 SciMLBase = "2.155, 3"
 SciMLStructures = "1"
 Setfield = "1"
@@ -47,6 +51,7 @@ Statistics = "1"
 StatsBase = "0.32.0, 0.33, 0.34"
 SymbolicUtils = "4"
 Symbolics = "7"
+Test = "1"
 julia = "1.10"
 
 [extras]
diff --git a/lib/DataDrivenDMD/LICENSE b/lib/DataDrivenDMD/LICENSE.md
similarity index 100%
rename from lib/DataDrivenDMD/LICENSE
rename to lib/DataDrivenDMD/LICENSE.md
diff --git a/lib/DataDrivenDMD/Project.toml b/lib/DataDrivenDMD/Project.toml
index 110d2223..53280ed5 100644
--- a/lib/DataDrivenDMD/Project.toml
+++ b/lib/DataDrivenDMD/Project.toml
@@ -7,10 +7,18 @@ version = "0.1.3"
 DataDrivenDiffEq = "2445eb08-9709-466a-b3fc-47e12bd697a2"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 
+[sources]
+DataDrivenDiffEq = {path = "../.."}
+
 [compat]
-DataDrivenDiffEq = "1.14"
+DataDrivenDiffEq = "1.15"
+LinearAlgebra = "1.10"
 OrdinaryDiffEq = "6, 7"
 OrdinaryDiffEqFunctionMap = "1, 2"
+SafeTestsets = "0.1"
+StableRNGs = "1"
+StatsBase = "0.34"
+Test = "1.10"
 julia = "1.10"
 
 [extras]
diff --git a/lib/DataDrivenDMD/README.md b/lib/DataDrivenDMD/README.md
new file mode 100644
index 00000000..dd66bc1c
--- /dev/null
+++ b/lib/DataDrivenDMD/README.md
@@ -0,0 +1,12 @@
+# DataDrivenDMD.jl
+
+[![Join the chat at https://julialang.zulipchat.com #sciml-bridged](https://img.shields.io/static/v1?label=Zulip&message=chat&color=9558b2&labelColor=389826)](https://julialang.zulipchat.com/#narrow/stream/279055-sciml-bridged)
+[![Global Docs](https://img.shields.io/badge/docs-SciML-blue.svg)](https://docs.sciml.ai/DataDrivenDiffEq/stable/)
+
+[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor%27s%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
+[![SciML Code Style](https://img.shields.io/static/v1?label=code%20style&message=SciML&color=9558b2&labelColor=389826)](https://github.com/SciML/SciMLStyle)
+
+DataDrivenDMD.jl is a component of the [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl) monorepo. Dynamic Mode Decomposition (DMD) and Koopman-based methods for discovering linear operator approximations of dynamical systems from data.
+While completely independent and usable on its own, users wanting the full data-driven modeling suite should use [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl).
+
+For a full description of the methods and their options, see the [DataDrivenDiffEq documentation](https://docs.sciml.ai/DataDrivenDiffEq/stable/).
diff --git a/lib/DataDrivenDMD/test/linear_autonomous.jl b/lib/DataDrivenDMD/test/Core/linear_autonomous.jl
similarity index 100%
rename from lib/DataDrivenDMD/test/linear_autonomous.jl
rename to lib/DataDrivenDMD/test/Core/linear_autonomous.jl
diff --git a/lib/DataDrivenDMD/test/linear_forced.jl b/lib/DataDrivenDMD/test/Core/linear_forced.jl
similarity index 100%
rename from lib/DataDrivenDMD/test/linear_forced.jl
rename to lib/DataDrivenDMD/test/Core/linear_forced.jl
diff --git a/lib/DataDrivenDMD/test/nonlinear_autonomous.jl b/lib/DataDrivenDMD/test/Core/nonlinear_autonomous.jl
similarity index 100%
rename from lib/DataDrivenDMD/test/nonlinear_autonomous.jl
rename to lib/DataDrivenDMD/test/Core/nonlinear_autonomous.jl
diff --git a/lib/DataDrivenDMD/test/nonlinear_forced.jl b/lib/DataDrivenDMD/test/Core/nonlinear_forced.jl
similarity index 100%
rename from lib/DataDrivenDMD/test/nonlinear_forced.jl
rename to lib/DataDrivenDMD/test/Core/nonlinear_forced.jl
diff --git a/lib/DataDrivenDMD/test/runtests.jl b/lib/DataDrivenDMD/test/runtests.jl
index a9fe50b4..81d9ddb2 100644
--- a/lib/DataDrivenDMD/test/runtests.jl
+++ b/lib/DataDrivenDMD/test/runtests.jl
@@ -5,21 +5,21 @@ using Test
 
 @info "Finished loading packages"
 
-const GROUP = get(ENV, "GROUP", "All")
+const GROUP = get(ENV, "DATADRIVENDIFFEQ_TEST_GROUP", get(ENV, "GROUP", "All"))
 
 @time begin
-    if GROUP == "All" || GROUP == "DataDrivenDMD"
+    if GROUP == "All" || GROUP == "Core" || GROUP == "DataDrivenDMD"
         @safetestset "Linear autonomous" begin
-            include("./linear_autonomous.jl")
+            include("./Core/linear_autonomous.jl")
         end
         @safetestset "Linear forced" begin
-            include("./linear_forced.jl")
+            include("./Core/linear_forced.jl")
         end
         @safetestset "Nonlinear autonomous" begin
-            include("./nonlinear_autonomous.jl")
+            include("./Core/nonlinear_autonomous.jl")
         end
         @safetestset "Nonlinear forced" begin
-            include("./nonlinear_forced.jl")
+            include("./Core/nonlinear_forced.jl")
         end
     end
 end
diff --git a/lib/DataDrivenDMD/test/test_groups.toml b/lib/DataDrivenDMD/test/test_groups.toml
new file mode 100644
index 00000000..8f657c06
--- /dev/null
+++ b/lib/DataDrivenDMD/test/test_groups.toml
@@ -0,0 +1,4 @@
+# Each sublibrary only defines functional ("Core") tests; there are no QA
+# (Aqua/JET/AllocCheck) suites here, so the default QA group is not declared.
+[Core]
+versions = ["lts", "1", "pre"]
diff --git a/lib/DataDrivenLux/LICENSE b/lib/DataDrivenLux/LICENSE.md
similarity index 100%
rename from lib/DataDrivenLux/LICENSE
rename to lib/DataDrivenLux/LICENSE.md
diff --git a/lib/DataDrivenLux/Project.toml b/lib/DataDrivenLux/Project.toml
index 03cb2c79..aa6675be 100644
--- a/lib/DataDrivenLux/Project.toml
+++ b/lib/DataDrivenLux/Project.toml
@@ -30,27 +30,37 @@ StatsBase = "2913bbd2-ae8a-5f71-8c99-4fb6c76f3a91"
 TransformVariables = "84d833dd-6860-57f9-a1a7-6da5db126cff"
 WeightInitializers = "d49dbf32-c5c2-4618-8acc-27bb2598ef2d"
 
+[sources]
+DataDrivenDiffEq = {path = "../.."}
+
 [compat]
 AbstractDifferentiation = "0.6"
 ChainRulesCore = "1.15"
 CommonSolve = "0.2.4"
 ComponentArrays = "0.15"
 ConcreteStructs = "0.2.3"
-DataDrivenDiffEq = "1.14"
-OrdinaryDiffEq = "6, 7"
+DataDrivenDiffEq = "1.15"
+Distributed = "1.10"
 Distributions = "0.25"
 DistributionsAD = "0.6"
 DocStringExtensions = "0.9.3"
 ForwardDiff = "0.10, 1"
 IntervalArithmetic = "0.22, 0.23, 1"
 InverseFunctions = "0.1"
+LinearAlgebra = "1.10"
+Logging = "1.10"
 Lux = "1"
 LuxCore = "1"
 Optim = "1.7, 2"
 Optimisers = "0.3, 0.4"
+OrdinaryDiffEq = "6, 7"
 ProgressMeter = "1.7"
+Random = "1.10"
+SafeTestsets = "0.1"
 Setfield = "1"
+StableRNGs = "1"
 StatsBase = "0.34.3"
+Test = "1.10"
 TransformVariables = "0.8"
 WeightInitializers = "1"
 julia = "1.10"
diff --git a/lib/DataDrivenLux/README.md b/lib/DataDrivenLux/README.md
new file mode 100644
index 00000000..8f00d27e
--- /dev/null
+++ b/lib/DataDrivenLux/README.md
@@ -0,0 +1,12 @@
+# DataDrivenLux.jl
+
+[![Join the chat at https://julialang.zulipchat.com #sciml-bridged](https://img.shields.io/static/v1?label=Zulip&message=chat&color=9558b2&labelColor=389826)](https://julialang.zulipchat.com/#narrow/stream/279055-sciml-bridged)
+[![Global Docs](https://img.shields.io/badge/docs-SciML-blue.svg)](https://docs.sciml.ai/DataDrivenDiffEq/stable/)
+
+[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor%27s%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
+[![SciML Code Style](https://img.shields.io/static/v1?label=code%20style&message=SciML&color=9558b2&labelColor=389826)](https://github.com/SciML/SciMLStyle)
+
+DataDrivenLux.jl is a component of the [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl) monorepo. Deep-learning-based structure search, built on Lux.jl, for discovering governing equations via differentiable directed-acyclic-graph candidate models.
+While completely independent and usable on its own, users wanting the full data-driven modeling suite should use [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl).
+
+For a full description of the methods and their options, see the [DataDrivenDiffEq documentation](https://docs.sciml.ai/DataDrivenDiffEq/stable/).
diff --git a/lib/DataDrivenLux/test/cache.jl b/lib/DataDrivenLux/test/Core/cache.jl
similarity index 100%
rename from lib/DataDrivenLux/test/cache.jl
rename to lib/DataDrivenLux/test/Core/cache.jl
diff --git a/lib/DataDrivenLux/test/candidate.jl b/lib/DataDrivenLux/test/Core/candidate.jl
similarity index 100%
rename from lib/DataDrivenLux/test/candidate.jl
rename to lib/DataDrivenLux/test/Core/candidate.jl
diff --git a/lib/DataDrivenLux/test/crossentropy_solve.jl b/lib/DataDrivenLux/test/Core/crossentropy_solve.jl
similarity index 100%
rename from lib/DataDrivenLux/test/crossentropy_solve.jl
rename to lib/DataDrivenLux/test/Core/crossentropy_solve.jl
diff --git a/lib/DataDrivenLux/test/graphs.jl b/lib/DataDrivenLux/test/Core/graphs.jl
similarity index 100%
rename from lib/DataDrivenLux/test/graphs.jl
rename to lib/DataDrivenLux/test/Core/graphs.jl
diff --git a/lib/DataDrivenLux/test/layers.jl b/lib/DataDrivenLux/test/Core/layers.jl
similarity index 100%
rename from lib/DataDrivenLux/test/layers.jl
rename to lib/DataDrivenLux/test/Core/layers.jl
diff --git a/lib/DataDrivenLux/test/nodes.jl b/lib/DataDrivenLux/test/Core/nodes.jl
similarity index 100%
rename from lib/DataDrivenLux/test/nodes.jl
rename to lib/DataDrivenLux/test/Core/nodes.jl
diff --git a/lib/DataDrivenLux/test/randomsearch_solve.jl b/lib/DataDrivenLux/test/Core/randomsearch_solve.jl
similarity index 100%
rename from lib/DataDrivenLux/test/randomsearch_solve.jl
rename to lib/DataDrivenLux/test/Core/randomsearch_solve.jl
diff --git a/lib/DataDrivenLux/test/reinforce_solve.jl b/lib/DataDrivenLux/test/Core/reinforce_solve.jl
similarity index 100%
rename from lib/DataDrivenLux/test/reinforce_solve.jl
rename to lib/DataDrivenLux/test/Core/reinforce_solve.jl
diff --git a/lib/DataDrivenLux/test/runtests.jl b/lib/DataDrivenLux/test/runtests.jl
index 9db36e13..f3a27c55 100644
--- a/lib/DataDrivenLux/test/runtests.jl
+++ b/lib/DataDrivenLux/test/runtests.jl
@@ -5,25 +5,25 @@ using Test
 
 @info "Finished loading packages"
 
-const GROUP = get(ENV, "GROUP", "All")
+const GROUP = get(ENV, "DATADRIVENDIFFEQ_TEST_GROUP", get(ENV, "GROUP", "All"))
 
 @testset "DataDrivenLux" begin
-    if GROUP == "All" || GROUP == "DataDrivenLux"
+    if GROUP == "All" || GROUP == "Core" || GROUP == "DataDrivenLux"
         @testset "Lux" begin
-            @safetestset "Nodes" include("nodes.jl")
-            @safetestset "Layers" include("layers.jl")
-            @safetestset "Graphs" include("graphs.jl")
+            @safetestset "Nodes" include("Core/nodes.jl")
+            @safetestset "Layers" include("Core/layers.jl")
+            @safetestset "Graphs" include("Core/graphs.jl")
         end
 
         @testset "Caches" begin
-            @safetestset "Candidate" include("candidate.jl")
-            @safetestset "Cache" include("cache.jl")
+            @safetestset "Candidate" include("Core/candidate.jl")
+            @safetestset "Cache" include("Core/cache.jl")
         end
 
         @testset "Algorithms" begin
-            @safetestset "RandomSearch" include("randomsearch_solve.jl")
-            @safetestset "Reinforce" include("reinforce_solve.jl")
-            @safetestset "CrossEntropy" include("crossentropy_solve.jl")
+            @safetestset "RandomSearch" include("Core/randomsearch_solve.jl")
+            @safetestset "Reinforce" include("Core/reinforce_solve.jl")
+            @safetestset "CrossEntropy" include("Core/crossentropy_solve.jl")
         end
     end
 end
diff --git a/lib/DataDrivenLux/test/test_groups.toml b/lib/DataDrivenLux/test/test_groups.toml
new file mode 100644
index 00000000..8f657c06
--- /dev/null
+++ b/lib/DataDrivenLux/test/test_groups.toml
@@ -0,0 +1,4 @@
+# Each sublibrary only defines functional ("Core") tests; there are no QA
+# (Aqua/JET/AllocCheck) suites here, so the default QA group is not declared.
+[Core]
+versions = ["lts", "1", "pre"]
diff --git a/lib/DataDrivenSR/LICENSE b/lib/DataDrivenSR/LICENSE.md
similarity index 100%
rename from lib/DataDrivenSR/LICENSE
rename to lib/DataDrivenSR/LICENSE.md
diff --git a/lib/DataDrivenSR/Project.toml b/lib/DataDrivenSR/Project.toml
index 5da78b17..dcff83e5 100644
--- a/lib/DataDrivenSR/Project.toml
+++ b/lib/DataDrivenSR/Project.toml
@@ -8,10 +8,16 @@ DataDrivenDiffEq = "2445eb08-9709-466a-b3fc-47e12bd697a2"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 SymbolicRegression = "8254be44-1295-4e6a-a16d-46603ac705cb"
 
+[sources]
+DataDrivenDiffEq = {path = "../.."}
+
 [compat]
+DataDrivenDiffEq = "1.15"
 Reexport = "1.2"
-DataDrivenDiffEq = "1.14"
+StableRNGs = "1"
+StatsBase = "0.34"
 SymbolicRegression = "1"
+Test = "1.10"
 julia = "1.10"
 
 [extras]
diff --git a/lib/DataDrivenSR/README.md b/lib/DataDrivenSR/README.md
new file mode 100644
index 00000000..3187d7cb
--- /dev/null
+++ b/lib/DataDrivenSR/README.md
@@ -0,0 +1,12 @@
+# DataDrivenSR.jl
+
+[![Join the chat at https://julialang.zulipchat.com #sciml-bridged](https://img.shields.io/static/v1?label=Zulip&message=chat&color=9558b2&labelColor=389826)](https://julialang.zulipchat.com/#narrow/stream/279055-sciml-bridged)
+[![Global Docs](https://img.shields.io/badge/docs-SciML-blue.svg)](https://docs.sciml.ai/DataDrivenDiffEq/stable/)
+
+[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor%27s%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
+[![SciML Code Style](https://img.shields.io/static/v1?label=code%20style&message=SciML&color=9558b2&labelColor=389826)](https://github.com/SciML/SciMLStyle)
+
+DataDrivenSR.jl is a component of the [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl) monorepo. Symbolic regression methods, built on SymbolicRegression.jl, for discovering closed-form governing equations from data.
+While completely independent and usable on its own, users wanting the full data-driven modeling suite should use [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl).
+
+For a full description of the methods and their options, see the [DataDrivenDiffEq documentation](https://docs.sciml.ai/DataDrivenDiffEq/stable/).
diff --git a/lib/DataDrivenSR/test/Core/symbolic_regression.jl b/lib/DataDrivenSR/test/Core/symbolic_regression.jl
new file mode 100644
index 00000000..be923bb8
--- /dev/null
+++ b/lib/DataDrivenSR/test/Core/symbolic_regression.jl
@@ -0,0 +1,62 @@
+using DataDrivenDiffEq
+using DataDrivenSR
+using Test
+using StableRNGs
+
+rng = StableRNG(42)
+X = rand(rng, 2, 50)
+
+@testset "Simple" begin
+    alg = DataDrivenSR.EQSearch(
+        eq_options = Options(
+            unary_operators = [sin, exp],
+            binary_operators = [*], maxdepth = 1,
+            seed = 42,
+            verbosity = -1, progress = false
+        )
+    )
+    f(x) = [sin(x[1]); exp(x[2])]
+    Y = hcat(map(f, eachcol(X))...)
+    prob = DirectDataDrivenProblem(X, Y)
+    res = solve(prob, alg)
+    @test r2(res) >= 0.95
+    @test rss(res) <= 1.0e-5
+end
+
+@testset "Univariate" begin
+    alg = DataDrivenSR.EQSearch(
+        eq_options = Options(
+            unary_operators = [sin, exp],
+            binary_operators = [*], maxdepth = 1,
+            seed = 42,
+            verbosity = -1, progress = false
+        )
+    )
+
+    Y = sin.(X[1:1, :])
+    prob = DirectDataDrivenProblem(X, Y)
+    res = solve(prob, alg)
+    @test r2(res) >= 0.95
+    @test rss(res) <= 1.0e-5
+end
+
+@testset "Lifted" begin
+    alg = DataDrivenSR.EQSearch(
+        eq_options = Options(
+            unary_operators = [sin, exp],
+            binary_operators = [+], maxdepth = 1,
+            seed = 42,
+            verbosity = -1, progress = false
+        )
+    )
+
+    f(x) = [sin(x[1] .^ 2); exp(x[2] * x[1])]
+    Y = hcat(map(f, eachcol(X))...)
+
+    @variables x y
+    basis = Basis([x; y; x^2; y^2; x * y], [x; y])
+    prob = DirectDataDrivenProblem(X, Y)
+    res = solve(prob, basis, alg)
+    @test r2(res) >= 0.95
+    @test rss(res) <= 1.0e-5
+end
diff --git a/lib/DataDrivenSR/test/runtests.jl b/lib/DataDrivenSR/test/runtests.jl
index be923bb8..83c48667 100644
--- a/lib/DataDrivenSR/test/runtests.jl
+++ b/lib/DataDrivenSR/test/runtests.jl
@@ -3,60 +3,10 @@ using DataDrivenSR
 using Test
 using StableRNGs
 
-rng = StableRNG(42)
-X = rand(rng, 2, 50)
+const GROUP = get(ENV, "DATADRIVENDIFFEQ_TEST_GROUP", get(ENV, "GROUP", "All"))
 
-@testset "Simple" begin
-    alg = DataDrivenSR.EQSearch(
-        eq_options = Options(
-            unary_operators = [sin, exp],
-            binary_operators = [*], maxdepth = 1,
-            seed = 42,
-            verbosity = -1, progress = false
-        )
-    )
-    f(x) = [sin(x[1]); exp(x[2])]
-    Y = hcat(map(f, eachcol(X))...)
-    prob = DirectDataDrivenProblem(X, Y)
-    res = solve(prob, alg)
-    @test r2(res) >= 0.95
-    @test rss(res) <= 1.0e-5
-end
-
-@testset "Univariate" begin
-    alg = DataDrivenSR.EQSearch(
-        eq_options = Options(
-            unary_operators = [sin, exp],
-            binary_operators = [*], maxdepth = 1,
-            seed = 42,
-            verbosity = -1, progress = false
-        )
-    )
-
-    Y = sin.(X[1:1, :])
-    prob = DirectDataDrivenProblem(X, Y)
-    res = solve(prob, alg)
-    @test r2(res) >= 0.95
-    @test rss(res) <= 1.0e-5
-end
-
-@testset "Lifted" begin
-    alg = DataDrivenSR.EQSearch(
-        eq_options = Options(
-            unary_operators = [sin, exp],
-            binary_operators = [+], maxdepth = 1,
-            seed = 42,
-            verbosity = -1, progress = false
-        )
-    )
-
-    f(x) = [sin(x[1] .^ 2); exp(x[2] * x[1])]
-    Y = hcat(map(f, eachcol(X))...)
-
-    @variables x y
-    basis = Basis([x; y; x^2; y^2; x * y], [x; y])
-    prob = DirectDataDrivenProblem(X, Y)
-    res = solve(prob, basis, alg)
-    @test r2(res) >= 0.95
-    @test rss(res) <= 1.0e-5
+if GROUP == "All" || GROUP == "Core" || GROUP == "DataDrivenSR"
+    @testset "Symbolic Regression" begin
+        include("./Core/symbolic_regression.jl")
+    end
 end
diff --git a/lib/DataDrivenSR/test/test_groups.toml b/lib/DataDrivenSR/test/test_groups.toml
new file mode 100644
index 00000000..8f657c06
--- /dev/null
+++ b/lib/DataDrivenSR/test/test_groups.toml
@@ -0,0 +1,4 @@
+# Each sublibrary only defines functional ("Core") tests; there are no QA
+# (Aqua/JET/AllocCheck) suites here, so the default QA group is not declared.
+[Core]
+versions = ["lts", "1", "pre"]
diff --git a/lib/DataDrivenSparse/LICENSE b/lib/DataDrivenSparse/LICENSE.md
similarity index 100%
rename from lib/DataDrivenSparse/LICENSE
rename to lib/DataDrivenSparse/LICENSE.md
diff --git a/lib/DataDrivenSparse/Project.toml b/lib/DataDrivenSparse/Project.toml
index 00b82d72..0ae18070 100644
--- a/lib/DataDrivenSparse/Project.toml
+++ b/lib/DataDrivenSparse/Project.toml
@@ -9,12 +9,21 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 
+[sources]
+DataDrivenDiffEq = {path = "../.."}
 
 [compat]
-julia = "1.10"
-DataDrivenDiffEq = "1.14"
+DataDrivenDiffEq = "1.15"
+LinearAlgebra = "1.10"
 OrdinaryDiffEq = "6, 7"
+Printf = "1.10"
+Random = "1.10"
 Reexport = "1.2"
+SafeTestsets = "0.1"
+StableRNGs = "1"
+StatsBase = "0.34"
+Test = "1.10"
+julia = "1.10"
 
 [extras]
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
diff --git a/lib/DataDrivenSparse/README.md b/lib/DataDrivenSparse/README.md
new file mode 100644
index 00000000..2100d556
--- /dev/null
+++ b/lib/DataDrivenSparse/README.md
@@ -0,0 +1,12 @@
+# DataDrivenSparse.jl
+
+[![Join the chat at https://julialang.zulipchat.com #sciml-bridged](https://img.shields.io/static/v1?label=Zulip&message=chat&color=9558b2&labelColor=389826)](https://julialang.zulipchat.com/#narrow/stream/279055-sciml-bridged)
+[![Global Docs](https://img.shields.io/badge/docs-SciML-blue.svg)](https://docs.sciml.ai/DataDrivenDiffEq/stable/)
+
+[![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor%27s%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
+[![SciML Code Style](https://img.shields.io/static/v1?label=code%20style&message=SciML&color=9558b2&labelColor=389826)](https://github.com/SciML/SciMLStyle)
+
+DataDrivenSparse.jl is a component of the [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl) monorepo. Sparse regression methods (e.g. SINDy, STLSQ, ADMM) for discovering parsimonious governing equations from data.
+While completely independent and usable on its own, users wanting the full data-driven modeling suite should use [DataDrivenDiffEq.jl](https://github.com/SciML/DataDrivenDiffEq.jl).
+
+For a full description of the methods and their options, see the [DataDrivenDiffEq documentation](https://docs.sciml.ai/DataDrivenDiffEq/stable/).
diff --git a/lib/DataDrivenSparse/test/cartpole.jl b/lib/DataDrivenSparse/test/Core/cartpole.jl
similarity index 100%
rename from lib/DataDrivenSparse/test/cartpole.jl
rename to lib/DataDrivenSparse/test/Core/cartpole.jl
diff --git a/lib/DataDrivenSparse/test/michaelis_menten.jl b/lib/DataDrivenSparse/test/Core/michaelis_menten.jl
similarity index 100%
rename from lib/DataDrivenSparse/test/michaelis_menten.jl
rename to lib/DataDrivenSparse/test/Core/michaelis_menten.jl
diff --git a/lib/DataDrivenSparse/test/pendulum.jl b/lib/DataDrivenSparse/test/Core/pendulum.jl
similarity index 100%
rename from lib/DataDrivenSparse/test/pendulum.jl
rename to lib/DataDrivenSparse/test/Core/pendulum.jl
diff --git a/lib/DataDrivenSparse/test/sparse_linear_solve.jl b/lib/DataDrivenSparse/test/Core/sparse_linear_solve.jl
similarity index 100%
rename from lib/DataDrivenSparse/test/sparse_linear_solve.jl
rename to lib/DataDrivenSparse/test/Core/sparse_linear_solve.jl
diff --git a/lib/DataDrivenSparse/test/runtests.jl b/lib/DataDrivenSparse/test/runtests.jl
index 9d797903..8971b69e 100644
--- a/lib/DataDrivenSparse/test/runtests.jl
+++ b/lib/DataDrivenSparse/test/runtests.jl
@@ -2,18 +2,22 @@ using DataDrivenDiffEq
 using DataDrivenSparse
 using SafeTestsets
 
-@safetestset "Basic Sparse Regression" begin
-    include("./sparse_linear_solve.jl")
-end
+const GROUP = get(ENV, "DATADRIVENDIFFEQ_TEST_GROUP", get(ENV, "GROUP", "All"))
 
-@safetestset "Pendulum" begin
-    include("./pendulum.jl")
-end
+if GROUP == "All" || GROUP == "Core" || GROUP == "DataDrivenSparse"
+    @safetestset "Basic Sparse Regression" begin
+        include("./Core/sparse_linear_solve.jl")
+    end
 
-@safetestset "Michaelis Menten" begin
-    include("./michaelis_menten.jl")
-end
+    @safetestset "Pendulum" begin
+        include("./Core/pendulum.jl")
+    end
+
+    @safetestset "Michaelis Menten" begin
+        include("./Core/michaelis_menten.jl")
+    end
 
-@safetestset "Cartpole" begin
-    include("./cartpole.jl")
+    @safetestset "Cartpole" begin
+        include("./Core/cartpole.jl")
+    end
 end
diff --git a/lib/DataDrivenSparse/test/test_groups.toml b/lib/DataDrivenSparse/test/test_groups.toml
new file mode 100644
index 00000000..8f657c06
--- /dev/null
+++ b/lib/DataDrivenSparse/test/test_groups.toml
@@ -0,0 +1,4 @@
+# Each sublibrary only defines functional ("Core") tests; there are no QA
+# (Aqua/JET/AllocCheck) suites here, so the default QA group is not declared.
+[Core]
+versions = ["lts", "1", "pre"]
diff --git a/test/basis/basis.jl b/test/Core/basis.jl
similarity index 100%
rename from test/basis/basis.jl
rename to test/Core/basis.jl
diff --git a/test/commonsolve/commonsolve.jl b/test/Core/commonsolve.jl
similarity index 100%
rename from test/commonsolve/commonsolve.jl
rename to test/Core/commonsolve.jl
diff --git a/test/basis/generators.jl b/test/Core/generators.jl
similarity index 100%
rename from test/basis/generators.jl
rename to test/Core/generators.jl
diff --git a/test/basis/implicit_basis.jl b/test/Core/implicit_basis.jl
similarity index 100%
rename from test/basis/implicit_basis.jl
rename to test/Core/implicit_basis.jl
diff --git a/test/problem/problem.jl b/test/Core/problem.jl
similarity index 100%
rename from test/problem/problem.jl
rename to test/Core/problem.jl
diff --git a/test/problem/samplers.jl b/test/Core/samplers.jl
similarity index 100%
rename from test/problem/samplers.jl
rename to test/Core/samplers.jl
diff --git a/test/solution/solution.jl b/test/Core/solution.jl
similarity index 100%
rename from test/solution/solution.jl
rename to test/Core/solution.jl
diff --git a/test/utils.jl b/test/Core/utils.jl
similarity index 100%
rename from test/utils.jl
rename to test/Core/utils.jl
diff --git a/test/runtests.jl b/test/runtests.jl
index 22fbae2f..8f418b2d 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -4,59 +4,96 @@ using SafeTestsets, Test, Pkg
 
 const GROUP = get(ENV, "GROUP", "All")
 
-function dev_subpkg(subpkg)
-    subpkg_path = joinpath(dirname(@__DIR__), "lib", subpkg)
-    return Pkg.develop(PackageSpec(path = subpkg_path))
-end
-
-function activate_subpkg_env(subpkg)
-    subpkg_path = joinpath(dirname(@__DIR__), "lib", subpkg)
-    Pkg.activate(subpkg_path)
-    Pkg.develop(PackageSpec(path = subpkg_path))
-    return Pkg.instantiate()
-end
-
 function activate_nopre_env()
     Pkg.activate(joinpath(@__DIR__, "nopre"))
     Pkg.develop(PackageSpec(path = dirname(@__DIR__)))
     return Pkg.instantiate()
 end
 
+# GROUP can name a sublibrary (e.g. "DataDrivenDMD" -> Core test group) or
+# "{sublibrary}_{TEST_GROUP}" for a custom group (e.g. "DataDrivenDMD_QA").
+# Sublibraries declare any non-default groups in test/test_groups.toml; the
+# DATADRIVENDIFFEQ_TEST_GROUP env var threads the group into the sublib's
+# own runtests.jl. CI dispatches sublibraries through SublibraryCI.yml, so
+# this branch is primarily for running a sublibrary's suite locally.
+function _detect_sublibrary_group(group, lib_dir)
+    isdir(joinpath(lib_dir, group)) && return (group, "Core")
+    for i in length(group):-1:1
+        if group[i] == '_' && isdir(joinpath(lib_dir, group[1:(i - 1)]))
+            return (group[1:(i - 1)], group[(i + 1):end])
+        end
+    end
+    return (group, "Core")
+end
+
 @time begin
-    if GROUP == "All" || GROUP == "Core" || GROUP == "Downstream"
+    lib_dir = joinpath(dirname(@__DIR__), "lib")
+    base_group, test_group = _detect_sublibrary_group(GROUP, lib_dir)
+
+    if isdir(joinpath(lib_dir, base_group))
+        Pkg.activate(joinpath(lib_dir, base_group))
+        # On Julia < 1.11 the [sources] section is not honored; develop the
+        # in-repo path dependencies (transitively) so the sublibrary tests run
+        # against this checkout of DataDrivenDiffEq rather than a released one.
+        if VERSION < v"1.11.0-DEV.0"
+            developed = Set{String}()
+            push!(developed, normpath(joinpath(lib_dir, base_group)))
+            specs = Pkg.PackageSpec[]
+            queue = [joinpath(lib_dir, base_group)]
+            while !isempty(queue)
+                pkg_dir = popfirst!(queue)
+                toml_path = joinpath(pkg_dir, "Project.toml")
+                isfile(toml_path) || continue
+                toml = Pkg.TOML.parsefile(toml_path)
+                if haskey(toml, "sources")
+                    for (dep_name, source_spec) in toml["sources"]
+                        if source_spec isa Dict && haskey(source_spec, "path")
+                            dep_path = normpath(joinpath(pkg_dir, source_spec["path"]))
+                            if isdir(dep_path) && !(dep_path in developed)
+                                push!(developed, dep_path)
+                                @info "Queuing local source dependency" dep_name dep_path
+                                push!(specs, Pkg.PackageSpec(path = dep_path))
+                                push!(queue, dep_path)
+                            end
+                        end
+                    end
+                end
+            end
+            isempty(specs) || Pkg.develop(specs)
+        end
+        withenv("DATADRIVENDIFFEQ_TEST_GROUP" => test_group) do
+            Pkg.test(base_group, coverage = true)
+        end
+    elseif GROUP == "nopre"
+        # nopre tests are excluded from Julia pre-release versions in CI
+        # to avoid failures from upstream changes (e.g., JET type inference)
+        activate_nopre_env()
+        @safetestset "JET Static Analysis" begin
+            include("nopre/jet_tests.jl")
+        end
+    elseif GROUP == "All" || GROUP == "Core" || GROUP == "Downstream"
         @testset "All" begin
             @safetestset "Basis" begin
-                include("./basis/basis.jl")
+                include("./Core/basis.jl")
             end
             @safetestset "Implicit Basis" begin
-                include("./basis/implicit_basis.jl")
+                include("./Core/implicit_basis.jl")
             end
             @safetestset "Basis generators" begin
-                include("./basis/generators.jl")
+                include("./Core/generators.jl")
             end
             @safetestset "DataDrivenProblem" begin
-                include("./problem/problem.jl")
+                include("./Core/problem.jl")
             end
             @safetestset "DataDrivenSolution" begin
-                include("./solution/solution.jl")
+                include("./Core/solution.jl")
             end
             @safetestset "Utilities" begin
-                include("./utils.jl")
+                include("./Core/utils.jl")
             end
             @safetestset "CommonSolve" begin
-                include("./commonsolve/commonsolve.jl")
+                include("./Core/commonsolve.jl")
             end
         end
-    elseif GROUP == "nopre"
-        # nopre tests are excluded from Julia pre-release versions in CI
-        # to avoid failures from upstream changes (e.g., JET type inference)
-        activate_nopre_env()
-        @safetestset "JET Static Analysis" begin
-            include("nopre/jet_tests.jl")
-        end
-    else
-        dev_subpkg(GROUP)
-        subpkg_path = joinpath(dirname(@__DIR__), "lib", GROUP)
-        Pkg.test(PackageSpec(name = GROUP, path = subpkg_path); coverage = true)
     end
 end
diff --git a/test/test_groups.toml b/test/test_groups.toml
new file mode 100644
index 00000000..dfe8e145
--- /dev/null
+++ b/test/test_groups.toml
@@ -0,0 +1,12 @@
+# Test group declarations for the DataDrivenDiffEq root package.
+# The base-environment Core group runs in the package's main test env and is
+# the only group in the `All` run. The `nopre` group is a dep-adding group: it
+# carries JET in test/nopre/Project.toml, is excluded from `All`, and (as its
+# name says) does not run on prerelease Julia. Its CI.yml matrix group input is
+# lowercase, so the group name here is kept lowercase to stay consistent.
+
+[Core]
+versions = ["lts", "1", "pre"]
+
+[nopre]
+versions = ["lts", "1"]