chore: update PR checks and dev tooling

.devcontainer/post_create.sh

@@ -9,5 +9,7 @@ mise trust .
 
 mise install
 
+mise exec -- go mod download
+
 mise exec -- go install -v golang.org/x/tools/gopls@latest
 mise exec -- go install -v github.com/go-delve/delve/cmd/dlv@latest

.github/workflows/pr-check.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   check:
-    name: Lint & Test
+    name: Check
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -21,5 +21,5 @@ jobs:
       - name: Download Go dependencies
         run: go mod download
 
-      - name: Run check (lint + test)
-        run: make check
+      - name: Run check
+        run: make check NEW_FROM_REV=origin/${{ github.base_ref }}

.golangci.yaml

@@ -5,9 +5,7 @@ run:
   timeout: 5m
 
 issues:
-  new: true
   whole-files: true
-  new-from-rev: HEAD~
   max-same-issues: 50
 
 severity:

AGENTS.md

@@ -49,7 +49,6 @@ All commands should be run from the repository root.
 
 | Command | Description |
 |---------|-------------|
-| `make fmt` | Format all Go source files via `golangci-lint fmt` |
 | `make lint` | Run linter (`golangci-lint run`) |
 | `make fix` | Run linter with auto-fix (`golangci-lint run --fix`) |
 | `make test` | Run all tests with race detector (`go test -v -race -failfast ./...`) |
@@ -62,7 +61,6 @@ Always run `make check` before considering a change complete.
 ### Code Style
 
 - Follow standard Go conventions (`gofmt`, `goimports`).
-- Use `make fmt` to format code; do not manually reformat.
 - Exported symbols must have GoDoc comments. Keep them concise and consistent with the existing style.
 - Internal helpers (unexported) should be commented only when non-obvious.
 

Makefile

@@ -1,13 +1,16 @@
-fmt:
-	golangci-lint fmt -v ./...
+NEW_FROM_REV ?= HEAD
 
 fix:
-	golangci-lint run -v --fix ./...
+	go mod tidy
+	golangci-lint run -v --new-from-rev=$(NEW_FROM_REV) --fix ./...
 
 lint:
-	golangci-lint run -v ./...
+	golangci-lint run -v --new-from-rev=$(NEW_FROM_REV) ./...
 
 test:
 	go test -v -race -failfast ./...
 
-check: lint test
+check-tidy:
+	go mod tidy -diff
+
+check: check-tidy lint test