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/ux/user-flows.md

@@ -0,0 +1,99 @@
+# User Flows
+
+## Add Job Flow
+
+Recommended:
+
+Add Job
+
+↓
+
+Enter URL
+
+↓
+
+Import Details
+
+↓
+
+Review Information
+
+↓
+
+Create Application
+
+↓
+
+CV
+
+↓
+
+Cover Letter
+
+↓
+
+Portfolio
+
+↓
+
+Files
+
+↓
+
+Complete
+
+---
+
+# CV Creation Flow
+
+Career Profile
+
+↓
+
+Generate CV
+
+↓
+
+Choose Theme
+
+↓
+
+Customise
+
+↓
+
+Preview
+
+↓
+
+Export
+
+---
+
+# Tailored Application Flow
+
+Job
+
+↓
+
+Analyse Requirements
+
+↓
+
+Generate Suggestions
+
+↓
+
+Create Tailored CV
+
+↓
+
+Review
+
+↓
+
+Save Copy
+
+↓
+
+Export