Rebase to latest and update to libbitcoinpqc 0.4

.editorconfig

@@ -13,7 +13,7 @@ trim_trailing_whitespace = true
 [*.{h,cpp,rs,py,sh}]
 indent_size = 4
 
-# .cirrus.yml, etc.
+# ci.yml, etc.
 [*.yml]
 indent_size = 2
 

.gitattributes

@@ -1 +1,2 @@
 src/clientversion.cpp export-subst
+src/CMakeLists.txt export-subst

.github/ISSUE_TEMPLATE/bug.yml

@@ -10,6 +10,7 @@ body:
         * General bitcoin questions and/or support requests should use Bitcoin StackExchange at https://bitcoin.stackexchange.com.
         * For reporting security issues, please read instructions at https://bitcoincore.org/en/contact/.
         * If the node is "stuck" during sync or giving "block checksum mismatch" errors, please ensure your hardware is stable by running `memtest` and observe CPU temperature with a load-test tool such as `linpack` before creating an issue.
+        * If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
 
         ----
   - type: checkboxes
@@ -78,7 +79,7 @@ body:
     id: os
     attributes:
       label: Operating system and version
-      placeholder: e.g. "MacOS Ventura 13.2" or "Ubuntu 22.04 LTS"
+      placeholder: e.g. "MacOS 26.0" or "Ubuntu 26.04 LTS"
     validations:
       required: true
   - type: textarea
@@ -90,4 +91,3 @@ body:
         e.g. OS/CPU and disk type, network connectivity
     validations:
       required: false
-

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -2,6 +2,11 @@ name: Feature Request
 description: Suggest an idea for this project.
 labels: [Feature]
 body:
+  - type: markdown
+    attributes:
+      value: |
+        If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
+
   - type: textarea
     id: feature
     attributes:

.github/ISSUE_TEMPLATE/gui_issue.yml

@@ -2,6 +2,11 @@ name: Issue or feature request related to the GUI
 description: Any report, issue or feature request related to the GUI
 labels: [GUI]
 body:
+- type: markdown
+  attributes:
+    value: |
+      If you use AI tools when opening this issue, please read the [AI policy](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md).
+
 - type: checkboxes
   id: acknowledgement
   attributes:

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,12 +1,13 @@
 <!--
 *** Please remove the following help text before submitting: ***
 
-Pull requests without a rationale and clear improvement may be closed
-immediately.
+Pull requests may be closed immediately if they:
+- do not have a rationale and clear improvement
+- do not adhere to doc/AI_POLICY.md
 
 GUI-related pull requests should be opened against
-https://github.com/bitcoin-core/gui
-first. See CONTRIBUTING.md
+https://github.com/bitcoin-core/gui first.
+See CONTRIBUTING.md
 -->
 
 <!--

.github/actions/cache/restore/action.yml

@@ -0,0 +1,55 @@
+name: 'Restore Caches'
+description: 'Restore ccache, depends sources, and built depends caches'
+inputs:
+  provider:
+    description: 'The cache provider to use'
+    required: true
+runs:
+  using: 'composite'
+  steps:
+    - name: Restore Ccache cache
+      id: ccache-cache
+      uses: ./.github/actions/cache/restore/internal
+      with:
+        path: ${{ env.CCACHE_DIR }}
+        key: ccache-${{ env.CONTAINER_NAME }}-${{ github.run_id }}
+        restore-keys: |
+          ccache-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
+
+    - name: Restore depends sources cache
+      id: depends-sources
+      uses: ./.github/actions/cache/restore/internal
+      with:
+        path: ${{ env.SOURCES_PATH }}
+        key: depends-sources-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
+        restore-keys: |
+          depends-sources-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
+
+    - name: Restore built depends cache
+      id: depends-built
+      uses: ./.github/actions/cache/restore/internal
+      with:
+        path: ${{ env.BASE_CACHE }}
+        key: depends-built-${{ env.CONTAINER_NAME }}-${{ env.DEPENDS_HASH }}
+        restore-keys: |
+          depends-built-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
+
+    - name: Restore previous releases cache
+      id: previous-releases
+      uses: ./.github/actions/cache/restore/internal
+      with:
+        path: ${{ env.PREVIOUS_RELEASES_DIR }}
+        key: previous-releases-${{ env.CONTAINER_NAME }}-${{ env.PREVIOUS_RELEASES_HASH }}
+        restore-keys: |
+          previous-releases-${{ env.CONTAINER_NAME }}-
+        provider: ${{ inputs.provider }}
+
+    - name: export cache hits
+      shell: bash
+      run: |
+        echo "depends-sources-cache-hit=${{ steps.depends-sources.outputs.cache-hit }}" >> $GITHUB_ENV
+        echo "depends-built-cache-hit=${{ steps.depends-built.outputs.cache-hit }}" >> $GITHUB_ENV
+        echo "previous-releases-cache-hit=${{ steps.previous-releases.outputs.cache-hit }}" >> $GITHUB_ENV