feat: AUTO-292 add Agent Run to n8n

[xsvfat]

Summary

• add a Run Agent operation with the complete Agent Run request surface
• return an immediate run ticket or poll the authenticated status endpoint until terminal/timeout
• preserve every existing operation while adding offline CI and a paid live regression suite
• update the operation list and distinguish one-shot REST Agent runs from interactive MCP sessions

Testing

• npm test — 42/42 passed
• npm run lint — passed with zero errors
• npm run build — passed; no test artifacts in dist
• npm run test:live — 7/7 passed against production-sfo, including wait/no-wait, timeout, 400/401, screenshot, and Smart Scrape
• protected ESLint and TypeScript configs unchanged

Assumptions made

• the plan's Markdown-corrupted status URL expression means encodeURIComponent(created.id), which is the only type-correct form of the documented /agent/run/{id} route
• the current n8n CLI's stricter lint is authoritative for compatibility: its shared sleep utility replaces the plan's restricted global timer, and final periods were added to the two multi-sentence descriptions

Linear

AUTO-292

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[xsvfat]

Automated review summary: no reviewer threads required action or pushback. Build, Prettier, and Devin Review are green; the branch head remained unchanged across follow-up sweeps. GitHub reports the PR mergeable with a clean merge state. Human review is requested from @andyMrtnzP.