feat: add /canary, /benchmark, /land-and-deploy skills (v0.7.0)

Three new skills that close the deploy loop:
- /canary: standalone post-deploy monitoring with browse daemon
- /benchmark: performance regression detection with Web Vitals
- /land-and-deploy: merge PR, wait for deploy, canary verify production

Incorporates patterns from community PR #151.

Co-Authored-By: HMAKT99 <HMAKT99@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/gen-skill-docs.test.ts

@@ -72,6 +72,9 @@ describe('gen-skill-docs', () => {
     { dir: 'plan-design-review', name: 'plan-design-review' },
     { dir: 'design-review', name: 'design-review' },
     { dir: 'design-consultation', name: 'design-consultation' },
+    { dir: 'canary', name: 'canary' },
+    { dir: 'benchmark', name: 'benchmark' },
+    { dir: 'land-and-deploy', name: 'land-and-deploy' },
   ];
 
   test('every skill has a SKILL.md.tmpl template', () => {