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-rendering.md

@@ -0,0 +1,68 @@
+# CV Rendering Architecture
+
+## Current Technology
+
+The application uses:
+
+HTML/CSS
+
+↓
+
+Playwright
+
+↓
+
+PDF
+
+---
+
+# Recommended Architecture
+
+Keep this approach.
+
+It provides:
+
+- Excellent print output.
+- CSS flexibility.
+- Browser rendering.
+
+---
+
+# Separation
+
+CV Data
+
+↓
+
+Renderer
+
+↓
+
+Theme
+
+↓
+
+Output
+
+---
+
+# Requirements
+
+Adding a new theme should not require:
+
+- Changing business logic.
+- Changing database structure.
+- Rewriting export code.
+
+---
+
+# Supported Outputs
+
+Primary:
+
+- PDF.
+
+Future:
+
+- DOCX.
+- HTML.