Add pre-commit hooks and code quality baseline

[pdettori]

Summary

Phase 3 of repo orchestration — establishes the code quality baseline that validates all subsequent PRs.

• Pre-commit hooks (.pre-commit-config.yaml):
  • prettier — TS, JSON, YAML, Markdown formatting
  • shellcheck — lint 11 shell scripts in deploy/knative/
  • hadolint — Dockerfile best practices
  • gitleaks — secret detection
  • Standard hooks: trailing-whitespace, end-of-file-fixer, check-yaml, check-merge-conflict
• Prettier config (.prettierrc, .prettierignore) — consistent formatting rules
• Makefile — lint, fmt, test, typecheck targets
• CLAUDE.md — repo overview, dev setup, conventions
• .claude/settings.json — Claude Code auto-approve permissions

Usage

pre-commit install          # install hooks locally
make lint                   # run all pre-commit hooks
make fmt                    # auto-format with prettier

Test plan

• pre-commit run --all-files passes (may report formatting fixups on first run)
• make typecheck passes (requires pi-fork built)
• make test passes with Redis running
• Verify shellcheck catches issues in deploy/ scripts
• Verify gitleaks doesn't false-positive on test fixtures

Assisted-By: Claude Code