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/research/cv-builder-patterns.md

@@ -0,0 +1,52 @@
+# CV Builder Patterns
+
+## Recommended Architecture
+
+Career Data
+
+↓
+
+CV Builder
+
+↓
+
+Theme
+
+↓
+
+Output
+
+
+---
+
+# Good Patterns
+
+## Structured Content
+
+User edits:
+
+- Experience.
+- Skills.
+- Education.
+
+Not raw documents.
+
+---
+
+## Live Preview
+
+Changes immediately visible.
+
+---
+
+## Template Independence
+
+Content should work with any template.
+
+---
+
+# Avoid
+
+Canva-style complexity.
+
+Users should not manually design every pixel.