🌱 Add pre-commit config and CI integration

Add standardized pre-commit hooks based on the canonical config from
llm-d/llm-d-infra:
- File hygiene (trailing whitespace, EOF, yaml/json checks, large files)
- Shell script linting (shellcheck)
- Dockerfile linting (hadolint)
- Markdown linting (markdownlint)
- YAML linting (yamllint)

Also adds pre-commit/action step to ci-pr-checks.yaml so pre-commit
runs automatically on PRs.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Andrew Anderson <andy@clubanderson.com>

Author: clubanderson

.github/workflows/ci-pr-checks.yaml

@@ -40,8 +40,13 @@ jobs:
       - name: Checkout source
         uses: actions/checkout@v6
 
-      - name: Sanity check repo contents
-        run: ls -la
+      - name: Set up Python (for pre-commit and CGO)
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Run pre-commit checks
+        uses: pre-commit/action@v3.0.1
 
       - name: Extract Go version from go.mod
         run: sed -En 's/^go (.*)$/GO_VERSION=\1/p' go.mod >> $GITHUB_ENV

.pre-commit-config.yaml

@@ -0,0 +1,60 @@
+# Pre-commit configuration for llm-d-inference-scheduler
+# Based on canonical config from llm-d/llm-d-infra
+#
+# Install: pip install pre-commit && pre-commit install
+# Run all: pre-commit run --all-files
+
+repos:
+  # General file hygiene hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+        args: [--unsafe]  # allows custom YAML tags used in k8s
+      - id: check-json
+      - id: check-added-large-files
+        args: [--maxkb=1000]
+      - id: check-merge-conflict
+      - id: mixed-line-ending
+      - id: check-case-conflict
+
+  # Shell script linting (requires shellcheck installed)
+  - repo: local
+    hooks:
+      - id: shellcheck
+        name: shellcheck
+        language: system
+        entry: shellcheck
+        args: [-x, --severity=warning]
+        types: [shell]
+
+  # Dockerfile linting (requires hadolint installed)
+  - repo: local
+    hooks:
+      - id: hadolint-docker
+        name: hadolint
+        language: system
+        entry: hadolint
+        args: [--failure-threshold, error]
+        files: Dockerfile.*
+        types: [file]
+
+  # Markdown linting
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.47.0
+    hooks:
+      - id: markdownlint
+        args: [--fix]
+
+  # YAML linting
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.37.1
+    hooks:
+      - id: yamllint
+        args:
+          - -d
+          - >-
+            {extends: default, rules: {line-length: {max: 250},
+            document-start: disable, truthy: {check-keys: false}}}