chore(skills): add agentic infrastructure installer

[BenSheridanEdwards]

Summary

• Add install-agentic-infrastructure, a repo skill for installing or upgrading agent guidance, local hooks, CI workflows, agentic tools, and PR proof contracts.
• Wire the new skill into CLAUDE.md so the public template exposes the adoption workflow directly.
• Include UI metadata for the skill chip/default prompt generated by the skill scaffolder.

Proof

• python3 /Users/agents/.codex/skills/.system/skill-creator/scripts/quick_validate.py .claude/skills/install-agentic-infrastructure
• pnpm check
• pnpm verify
• pnpm e2e
• Pre-commit hook passed during commit: typecheck, staged Biome, Fallow, gitleaks.
• Pre-push hook passed during push: Jest coverage, Vite build, Playwright E2E/accessibility.

Visual Proof

• N/A — skill/docs-only change; no rendered UI changed.

Risk

• Low. This adds a new workflow skill and a discoverability line; it does not alter runtime code or gate behaviour.

[github-actions]

Fallow audit report

Found 1 finding.

Details

Severity	Rule	Location	Description
minor	fallow/unused-dev-dependency	package.json:44	Package '@lhci/cli' is in devDependencies but never imported

Generated by fallow.

[github-actions]

Fallow audit report

0 inline findings selected for GitHub review.

[github-actions]

🗺️ StyleProof report

✓ No visual changes detected.