feat: Optimize linting by checking changed files

.github/workflows/lint.yaml

@@ -43,6 +43,7 @@ jobs:
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
+          fetch-depth: 0
       - name: Set up Python
         uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
@@ -55,6 +56,7 @@ jobs:
         uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
           go-version: '>=1.26.2'
+          cache: true
       - name: Set up terraform
         uses: hashicorp/setup-terraform@dfe3c3f87815947d99a8997f908cb6525fc44e9e # v4.0.1
       - name: Run pylint and yapf, go vet

AGENTS.md

@@ -87,26 +87,43 @@ The project uses `poetry` for Python dependency management, `pnpm` for website f
 ---
 
 ## Code Style & Formatting
-Always format and lint your code before proposing changes. The repository provides a unified script to check for style violations:
+Always format and lint your code before proposing changes. The repository provides a unified script to check for style violations with smart incremental checking:
 
-- **Run Linters & Format Checks**:
+- **Run Linters & Format Checks (Smart Auto-Detect)**:
+  By default, this automatically checks only the files and Go modules changed relative to `master` (or full repo if on clean master):
   ```bash
   poetry run tools/lint_and_format.sh
   ```
-  *Note: This script only checks for violations and does not automatically format code.*
+- **Run Full Check on Entire Repo**:
+  ```bash
+  poetry run tools/lint_and_format.sh --all
+  ```
+- **Run on Staged Changes Only**:
+  ```bash
+  poetry run tools/lint_and_format.sh --staged
+  ```
+- **Automatically Fix/Format Files**:
+  ```bash
+  poetry run tools/lint_and_format.sh --fix
+  ```
+- **Lint Specific Files**:
+  ```bash
+  poetry run tools/lint_and_format.sh osv/bug.py go/cmd/worker/main.go
+  ```
 
 ### Python Standards
-- Formatter: `yapf` (config: [`.style.yapf`](.style.yapf))
-- Linter: `pylint` (config: [`.pylintrc`](.pylintrc))
+- Formatter: `yapf` (config: [`.style.yapf`](.style.yapf), runs in parallel via `-p`)
+- Linter: `pylint` (config: [`.pylintrc`](.pylintrc), runs in parallel via `-j 0`)
 - **Formatting Command**: To automatically format Python files, run:
   ```bash
   poetry run yapf -i <path_to_file>.py
   ```
+  *(Or run `poetry run tools/lint_and_format.sh --fix`)*
 - **Rule**: When running Python scripts, always use `poetry run`.
 
 ### Go Standards
 - Linter: `golangci-lint`
-- **Running Go Linters**: Run `golangci-lint` using `go run` directly within the module directory (`go/`, `vulnfeeds/`, or `bindings/go/`):
+- **Running Go Linters**: Run `golangci-lint` using `go run` directly within the module directory (`go/`, `vulnfeeds/`, or `bindings/go/`), or run `tools/lint_and_format.sh` which automatically maps changed files to the enclosing module:
   ```bash
   cd go && go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.4.0 run ./...
   ```

Makefile

@@ -39,9 +39,16 @@ api-server-tests: ## Run Go API server integration tests
 update-api-snapshots: ## Update API query snapshots
 	UPDATE_SNAPS=true ./tools/apitester/run_tests.sh
 
-lint: ## Run linters and format checks
+lint: ## Run linters and format checks (smart auto-detect: changed files)
 	GOTOOLCHAIN=auto $(run-cmd) tools/lint_and_format.sh
 
+lint-all: ## Run linters and format checks across all files
+	GOTOOLCHAIN=auto $(run-cmd) tools/lint_and_format.sh --all
+
+format: ## Automatically format files where supported
+	GOTOOLCHAIN=auto $(run-cmd) tools/lint_and_format.sh --fix
+
+
 build-osv-protos:
 	cd osv && $(run-cmd) python -m grpc_tools.protoc --python_out=. --mypy_out=. --proto_path=. --proto_path=osv-schema/proto vulnerability.proto importfinding.proto