chore: install internal phase skill pack

[0thernet]

Summary

• adds five internal phase planning, implementation, review, and orchestration skills
• preserves pinned MIT upstream provenance and hardened fail-closed phase contracts
• keeps the public Wrench skill and every package/release coordinate unchanged

Verification

• exact scope: 18 files, all under .agents/skills
• five bundled skill validators, metadata/provenance checks, diff check, and typecheck pass
• complete gate: 3,343 main tests passed, 1 intentional skip, 0 failed, 143,145 assertions
• website/edge: 56 passed, 4,354 assertions; release workflow: 15 passed, 585 assertions
• omni: 18 passed, 606 assertions; package, clean consumer, build, and standalone smoke pass
• exact-head CI run 33268485335: Linux/check, macOS, Required, Vercel, and Preview Comments all succeeded at 4aa91a83cf6fa4ece130b01582740ecb423bdc3b
• independent exact-head review found no remaining blocker

[vercel]

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Project	Deployment	Actions	Updated (UTC)
wrench	Ready	Preview	Aug 29, 2026 6:31pm