feat: persistent run history per agent

[proofmancer]

Closes #4.

Summary

• New RunHistory client component. Fetches GET /api/agents/[id]/run (existing endpoint), renders the 25 most recent runs as a collapsed list. Click a row to expand the recorded JSONL output inline.
• Each row shows: prompt preview (~80 chars), relative time, duration, and status / exit code chip (green pass, red fail, amber running).
• AgentPanel mounts RunHistory below the live output box and bumps a version counter when a run ends, so the list refreshes without a full page reload.
• Tiny in-file formatters for relative time (3m ago) and duration (12.4s, 1m 04s). No new dep.

Build fix bundled

Same SQLITE_BUSY in next build's parallel page-data-collection workers as #13: busy_timeout = 5000 + idempotent migration guard. May conflict on src/lib/db.ts with #13 once one of them lands; trivial rebase.

Test plan

• Run an agent twice. Refresh. Both runs appear in History with timestamps and durations.
• Click a row, the full JSONL output for that run expands.
• Agent with zero runs shows "no runs yet."
• After a live run finishes, History updates automatically.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 39fc6a0a-3f7c-4d7d-b52d-a33755cbcd40

📥 Commits

Reviewing files that changed from the base of the PR and between 88cb8a7 and 19308fb.

📒 Files selected for processing (2)

• src/components/AgentPanel.tsx
• src/components/RunHistory.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/run-history

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