docs: reorganize tree, restore architecture + research from archive, add Phase 0 reports

Active docs/ was stub scaffolding while the real docs sat in docs/_archive/.
Restore and correct them, and record the Phase 0 work.

- docs/architecture/current.md: verified system map (from archived SYSTEM_OVERVIEW,
  9 corrections against code).
- docs/research/competitors.md: sourced competitor analysis (from archived
  PRODUCT_RESEARCH, feature matrix corrected).
- docs/decisions/ADR-002-job-application-model.md: the Job/JobApplication split.
- docs/application-discovery-report.md, docs/implementation-roadmap.md,
  docs/phase-0-foundation-report.md, docs/career-workspace-branch-assessment.md.
- Remove 10 zero-byte placeholder files that advertised content that never existed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/technical/deployment.md

@@ -0,0 +1,41 @@
+# Deployment
+
+## Current Goal
+
+Reliable production deployments.
+
+---
+
+# Deployment Requirements
+
+Before deploying:
+
+- Build succeeds.
+- Tests pass.
+- Database migrations reviewed.
+
+---
+
+# Production Safety
+
+Avoid:
+
+- Breaking migrations.
+- Downtime.
+- Lost data.
+
+---
+
+# Rollback
+
+Every deployment should have a recovery plan.
+
+---
+
+# Future SaaS
+
+Consider:
+
+- Automated deployments.
+- Staging environment.
+- Deployment approvals.