docs: require inline PR proof

[BenSheridanEdwards]

Why

Make inline screenshot proof part of the reusable agentic repo contract, not an optional agent habit.

What Changed

• Added .agents/skills/pr-inline-screenshot-proof/SKILL.md.
• Updated the Definition of Done, agent docs, Claude docs, and PR template with the inline proof law.

Proof

• pnpm verify - not run, docs-only change.
• pnpm e2e - not run, docs-only change.
• Visual proof attached or linked, or N/A with reason: N/A - no rendered UI changed.
• StyleProof reviewed, or N/A with reason: N/A - no rendered UI changed.
• Other proof: git diff --check passed.

CI Status

• Latest-sha GitHub Actions are green.
• Pending checks are named below: checks may start after PR creation.
• Failing checks are named below with the fix plan.

Risk And Rollback

Low risk docs/template change. Roll back by reverting this commit.

Definition Of Done

• Behaviour is covered by the E2E map when user-visible behaviour changed - not applicable, docs-only change.
• Logic is unit-tested where logic changed - not applicable.
• Accessibility was considered and verified for interactive/UI changes - not applicable.
• The diff follows .agents/project/ARCHITECTURE.md and CONVENTIONS.md.
• Any new architectural decision is recorded as an ADR - not applicable.
• No gates were bypassed or weakened.
• Followed .agents/project/DEFINITION_OF_DONE.md and .agents/skills/pr-inline-screenshot-proof/SKILL.md.
• Screenshots are committed and embedded inline with ![alt](...png?raw=1), or the proof section says Not applicable with the technical reason.
• The PR body has no bare screenshot links, local paths, relative paths, or proof placeholders.

[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.