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/career/cv-ai.md

@@ -0,0 +1,46 @@
+# AI CV Features
+
+## Purpose
+
+Use AI to improve applications.
+
+---
+
+# Supported Actions
+
+## Writing Assistance
+
+- Improve bullet points.
+- Fix grammar.
+- Make concise.
+- Suggest achievements.
+
+---
+
+## Generation
+
+Generate:
+
+- CV sections.
+- Cover letters.
+- Summaries.
+
+---
+
+# Rules
+
+AI must:
+
+- Use existing user data.
+- Avoid inventing experience.
+- Require approval.
+
+---
+
+# Future
+
+AI career assistant.
+
+Interview preparation.
+
+Career recommendations.