AIW-3 | Replace crons with sleeping workflow

[woywro]

Summary

Re-lands the AIW-3 changes that were reverted in #17.

• Replaces the Vercel Cron-based poller (/cron/poll) with a long-lived Vercel Workflow (src/workflows/poll.ts) that sleeps between cycles
• Adds GET /poll/start route that cancels any existing poll run and starts a fresh one, protected by DEPLOY_HOOK_SECRET
• Adds GitHub Action (.github/workflows/post-deploy.yml) to trigger the poll workflow on every successful deployment
• Renames CRON_SECRET → DEPLOY_HOOK_SECRET, changes default POLL_INTERVAL_MS from 5min to 15s
• Updates spec and vercel.json accordingly

Test plan

• Unit tests for /poll/start route
• Verify deployment triggers GitHub Action and starts poll workflow
• Confirm poll workflow discovers tickets and dispatches child workflows

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