feat: mosaic-* skill naming, new board/forge/prdy skills, doctor --fix auto-wiring

Skills:
- Rename all repo skills to mosaic-<name> convention (jarvis -> mosaic-jarvis, etc.)
- Update frontmatter name: fields to match directory names
- New mosaic-board skill: standalone Board of Directors multi-persona review
- New mosaic-forge skill: standalone Forge specialist pipeline
- New mosaic-prdy skill: PRD lifecycle (init/update/validate/status)

Wizard (packages/mosaic):
- Add mosaic-board, mosaic-forge, mosaic-prdy, mosaic-standards, mosaic-macp
  to RECOMMENDED_SKILLS
- Add new skills to SKILL_CATEGORIES for categorized browsing

Framework scripts (~/.config/mosaic/bin):
- mosaic (launcher): load skills from both skills/ and skills-local/ for Pi
- mosaic-doctor: add --fix flag for auto-wiring skills into all harnesses,
  Pi skill dir checks, Pi settings.json validation, mosaic-* presence checks
- mosaic-sync-skills: add Pi as 4th link target, fix find to follow symlinks
  in skills-local/, harden is_mosaic_skill_name() with -L fallback
- mosaic-link-runtime-assets: add Pi settings.json skills path patching,
  remove duplicate extension copy (launcher --extension is single source)
- mosaic-migrate-local-skills: add Pi to skill_roots, fix find for symlinks

YAML fixes:
- Quote description values containing colons in mosaic-deploy and
  mosaic-woodpecker SKILL.md frontmatter (fixes Pi parse errors)

packages/mosaic/src/constants.ts

@@ -35,4 +35,9 @@ export const RECOMMENDED_SKILLS = new Set([
   'writing-plans',
   'executing-plans',
   'architecture-patterns',
+  'mosaic-board',
+  'mosaic-forge',
+  'mosaic-prdy',
+  'mosaic-standards',
+  'mosaic-macp',
 ]);