Replace pre-commit with prek and add Claude skill

.claude/skills/prek-precommit-hook/SKILL.md

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+---
+name: prek-precommit-hook
+description: Instructions for managing and running git hooks using `prek`. Use this skill for any mention of pre-commit hooks, as `prek` overrides pre-commit hooks.
+---
+# Prek Pre-commit Hook Skill
+
+This skill provides instructions for using `prek`, a fast, native pre-commit runner that replaces the traditional Python-based `pre-commit`. **`prek` should be used for any mention of pre-commit hooks and overrides traditional pre-commit hooks.**
+
+## Commands
+
+Use the following commands to interact with `prek`:
+
+- `prek run`: Runs the configured hooks on the staged files.
+- `prek run --all-files`: Runs the configured hooks on all files in the repository.
+- `prek install`: Installs the git hooks into `.git/hooks`.
+- `prek uninstall`: Uninstalls the git hooks.
+- `prek list`: Lists the configured hooks.
+
+## Configuration
+
+The configuration is stored in `prek.toml` in the root of the repository.
+
+Example `prek.toml`:
+```toml
+[[repos]]
+repo = "https://github.com/pre-commit/pre-commit-hooks"
+rev = "v4.6.0"
+hooks = [
+    { id = "check-added-large-files" },
+]
+
+[[repos]]
+repo = "local"
+hooks = [
+    { id = "ruff-check", name = "Run ruff linter", entry = "uv run ruff check", language = "system", pass_filenames = false, always_run = true },
+]
+```
+
+## Workflow
+
+1.  **Before Committing**: `prek` hooks will run automatically if installed via `prek install`.
+2.  **Manual Check**: You can manually run checks using `prek run --all-files`.
+3.  **CI**: In CI environments, you can use `prek run --all-files` to enforce checks.

prek.toml

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+[[repos]]
+repo = "https://github.com/pre-commit/pre-commit-hooks"
+rev = "v4.6.0"
+hooks = [
+    { id = "check-added-large-files" },
+]
+
+[[repos]]
+repo = "local"
+hooks = [
+    { id = "lint-links", name = "Lint markdown links", entry = "make lint_links", language = "system", pass_filenames = false, always_run = true },
+    { id = "make-fmt", name = "Run formatter (make fmt)", entry = "make fmt", language = "system", pass_filenames = false, always_run = true },
+    { id = "ruff-check", name = "Run ruff linter", entry = "uv run ruff check", language = "system", pass_filenames = false, always_run = true },
+    { id = "ruff-complexity", name = "Check cyclomatic complexity", entry = "uv run ruff check --select C901", language = "system", pass_filenames = false, always_run = true },
+    { id = "ruff-tech-debt", name = "Check TODO/FIXME markers", entry = "uv run ruff check --select FIX", language = "system", pass_filenames = false, always_run = true },
+    { id = "pylint-duplicate-code", name = "Detect duplicate code", entry = "uv run pylint --disable=all --enable=R0801 src common utils", language = "system", pass_filenames = false, always_run = true },
+    { id = "ai-writing-check", name = "AI writing check", entry = "uv run python scripts/check_ai_writing.py", language = "system", pass_filenames = false, always_run = true },
+]