Prevent handoff with failed validation or PR checks

[rochecompaan]

Summary

• Added final validation-readiness and PR-check repair contracts to Patchmill implementation wrappers.
• Added the validation-only implementation wrapper as the recommended project-local default while preserving the raw Superpowers dependency.
• Synchronized installed skill-pack resources and metadata, and tightened path-mode runtime dependency validation.

Validation

• Final validation-readiness reviewer: node bin/patchmill.ts skills update passed (already up to date).
• Final validation-readiness reviewer: npm test passed (1061 tests, 0 failures).
• Final validation-readiness reviewer: npm run lint passed.
• Final validation-readiness reviewer: canonical/installed cmp loops passed.
• Final validation-readiness reviewer: installed metadata SHA verifier passed for pack 2026.07.2.
• Final validation-readiness reviewer: focused node --test suite passed (33 tests, 0 failures).
• Final validation-readiness reviewer: live config verifier passed.
• Final validation-readiness reviewer: git diff --check passed.
• Final validation-readiness reviewer: git status --short passed (clean).

Reviews

• Final Codex full-worktree review completed in prior session.
• Final thermo-nuclear full-worktree re-review passed after fixing executable task-script validation.
• Final validation-readiness review passed with no unresolved findings.

Closes #100