feat: v2.1 quality & infra improvements

[praeducer]

Summary

• Knowledge base enrichment: Added 3 new position-metrics.json entries (TReNDS Center, NeuroLex Labs, Hyperbloom) with SCOPE BOUNDARY markers, verified confidence levels, and relatedPositions
• CI/CD fixes: Added GitHub Actions permissions for issue creation, removed broken flag from Vercel deploy step, improved deploy URL extraction with error handling
• Prompt fine-tuning: Strengthened action verb instruction (20 preferred verbs), added location instruction (use profile.location not position city), clarified Tier 1 scope for concurrent/founder roles, added location validation in generate-resume.ts, tightened action verb threshold to 75%

Human Steps Required Before Merge

See for the full guide:

1. Configure GitHub Secrets — VERCEL_TOKEN, VERCEL_ORG_ID, VERCEL_PROJECT_ID
2. Disable Vercel Deployment Protection — preview URLs currently return HTTP 401
3. Add quantified metrics — TReNDS, NeuroLex, Hyperbloom, AWS positions need real numbers from Paul's records
4. Verify deploy workflow — push to main after secrets configured
5. (Optional) Cost optimization test — try reducing thinking effort

Test plan

• All 315 tests pass
• Resume generation produces correct location (Buford, GA from profile.location)
• Grounding rules intact (no cross-entity conflation)
• GitHub secrets configured (human step)
• Quantified metrics added (human step)
• Deploy workflow verified end-to-end (human step)

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