feat: /setup-deploy skill + platform-specific deploy verification

- New /setup-deploy skill: interactive guided setup for deploy configuration.
  Detects Fly.io, Render, Vercel, Netlify, Heroku, Railway, GitHub Actions,
  and custom deploy scripts. Writes config to CLAUDE.md with custom hooks
  section for non-standard setups.

- Enhanced deploy bootstrap: platform-specific URL resolution (fly.toml app
  → {app}.fly.dev, render.yaml → {service}.onrender.com, etc.), deploy
  status commands (fly status, heroku releases), and custom deploy hooks
  section in CLAUDE.md for manual/scripted deploys.

- Platform-specific deploy verification in /land-and-deploy Step 6:
  Strategy A (GitHub Actions polling), Strategy B (platform CLI: fly/render/heroku),
  Strategy C (auto-deploy: vercel/netlify), Strategy D (custom hooks from CLAUDE.md).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/skill-validation.test.ts

@@ -226,6 +226,7 @@ describe('Update check preamble', () => {
     'canary/SKILL.md',
     'benchmark/SKILL.md',
     'land-and-deploy/SKILL.md',
+    'setup-deploy/SKILL.md',
   ];
 
   for (const skill of skillsWithUpdateCheck) {
@@ -541,6 +542,7 @@ describe('v0.4.1 preamble features', () => {
     'canary/SKILL.md',
     'benchmark/SKILL.md',
     'land-and-deploy/SKILL.md',
+    'setup-deploy/SKILL.md',
   ];
 
   for (const skill of skillsWithPreamble) {
@@ -677,6 +679,7 @@ describe('Contributor mode preamble structure', () => {
     'canary/SKILL.md',
     'benchmark/SKILL.md',
     'land-and-deploy/SKILL.md',
+    'setup-deploy/SKILL.md',
   ];
 
   for (const skill of skillsWithPreamble) {