Add make pre-commit and pre-push targets, add CLAUDE.md

Standardize pre-commit (prettier + lint) and pre-push (+ typecheck + test +
build) Makefile targets to match CI checks and prevent push-then-fix cycles.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: gmoon

CLAUDE.md

@@ -0,0 +1,34 @@
+# CLAUDE.md
+
+Instructions for Claude Code when working in this repository.
+
+## Project Overview
+
+**forkzero.ai** — Marketing website for Forkzero. React 19 + Vite + TypeScript SPA. Hosted on S3 (`forkzero-web-prod`) + CloudFront.
+
+## Development Commands
+
+```bash
+# Install dependencies
+npm ci
+
+# Dev server
+npm run dev
+
+# Pre-commit gate (ALWAYS run before committing)
+make pre-commit
+
+# Pre-push gate (ALWAYS run before pushing)
+make pre-push
+```
+
+**Important**: Always run `make pre-commit` before any commit and `make pre-push` before any push. This matches what CI checks and prevents push-then-fix cycles.
+
+## Branding
+
+- "Forkzero" in prose, "FORKZERO" in logo (FORK bold, ZERO thin)
+- Never "ForkZero"
+
+## Shared Constants
+
+Install URLs and commands are defined in `src/constants.ts`. Import from there rather than hardcoding URLs.

Makefile

@@ -1,5 +1,14 @@
-.PHONY: ci install format lint typecheck build test clean
+.PHONY: ci install format lint typecheck build test clean pre-commit pre-push
 
+# Pre-commit gate: fast checks (format + lint)
+pre-commit: format lint
+	@echo "Pre-commit checks passed."
+
+# Pre-push gate: full checks (format + lint + typecheck + test + build)
+pre-push: pre-commit typecheck test build
+	@echo "Pre-push checks passed."
+
+# Full CI (same as pre-push with clean install)
 ci: install format lint typecheck build test
 	@echo "CI passed."
 
@@ -23,3 +32,12 @@ test:
 
 clean:
 	rm -rf dist node_modules
+
+help:
+	@echo "Available targets:"
+	@echo "  make pre-commit - Check formatting + lint (run before commit)"
+	@echo "  make pre-push   - Full check: format + lint + typecheck + test + build (run before push)"
+	@echo "  make ci         - Full CI with clean install"
+	@echo "  make build      - Build for production"
+	@echo "  make test       - Run tests with coverage"
+	@echo "  make clean      - Remove dist and node_modules"