docs: README + CLAUDE.md + .env.example + quickref reflect latest gates

.env.example

@@ -1,9 +1,60 @@
-# Database
+# =============================================================================
+# Environment variables — copy this file to .env and fill in your values.
+# See docs/guides/runbook.md for the full reference.
+# =============================================================================
+
+# --- Required for `pnpm dev` ---
+
+# Postgres connection. Matches `docker compose up -d` default.
 DATABASE_URL=postgresql://postgres:postgres@localhost:5433/template
 
-# Payload CMS
-PAYLOAD_SECRET=your-secret-here
+# Payload CMS encryption key. Any random 32+ char string in dev.
+PAYLOAD_SECRET=replace-with-a-random-32-char-string
+
+# --- Optional: app URLs (defaults work in dev) ---
 
-# App URLs
 NEXT_PUBLIC_APP_URL=http://localhost:3000
 CMS_URL=http://localhost:3001
+
+# Force dev-seed binders (mock repos) regardless of NODE_ENV. Useful for
+# running pnpm dev without Payload booted.
+# USE_DEV_SEED=true
+
+# --- Optional: Sentry observability ---
+# Leaving these unset → instrumentation falls back to the no-op tracer/logger.
+# Set the DSN for any app you want OTel + Sentry on.
+
+# WEB_NEXT_SENTRY_DSN=
+# NEXT_PUBLIC_WEB_NEXT_SENTRY_DSN=
+# CMS_SENTRY_DSN=
+# WEB_TANSTACK_SENTRY_DSN=
+# VITE_WEB_TANSTACK_SENTRY_DSN=
+
+# Source-map upload at build time (production only).
+# SENTRY_AUTH_TOKEN=
+# SENTRY_ORG=
+# SENTRY_PROJECT_WEB_NEXT=
+# SENTRY_PROJECT_CMS=
+# SENTRY_PROJECT_WEB_TANSTACK=
+
+# OTel trace sample rate (0.0 = none, 1.0 = all). 0.1 recommended in dev.
+# SENTRY_TRACES_SAMPLE_RATE=0.1
+# SENTRY_ENVIRONMENT=development
+
+# --- Optional: git commit SHA for releases ---
+
+# VERCEL_GIT_COMMIT_SHA=
+# NEXT_PUBLIC_VERCEL_GIT_COMMIT_SHA=
+# VITE_GIT_COMMIT_SHA=
+
+# --- Optional: core-audit (only when `gen core-package audit` is scaffolded) ---
+
+# Salt for GDPR pseudonymisation. PRODUCTION MUST set this to a stable secret.
+# AUDIT_PSEUDONYM_SALT=
+
+# --- Optional: sandcastle dispatch (only when running `pnpm work dispatch --execute`) ---
+
+# ANTHROPIC_API_KEY=
+# OPENAI_API_KEY=
+# GITHUB_TOKEN=
+# SANDCASTLE_PROVIDER=docker