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-themes.md

@@ -0,0 +1,78 @@
+# CV Theme System
+
+## Purpose
+
+Themes control presentation.
+
+They do not control data.
+
+---
+
+# Initial Theme Library
+
+Create:
+
+3-5 professional themes.
+
+Examples:
+
+## Professional
+
+Traditional ATS-friendly.
+
+---
+
+## Modern
+
+Clean two-column layout.
+
+---
+
+## Creative
+
+More visual.
+
+---
+
+## Technical
+
+Developer-focused.
+
+---
+
+## Minimal
+
+Simple and elegant.
+
+---
+
+# Theme Controls
+
+Users can customise:
+
+- Accent colour.
+- Fonts.
+- Photo visibility.
+- Icons.
+- Spacing.
+- Layout.
+
+---
+
+# Theme Requirements
+
+Themes must:
+
+- Work with all CV sections.
+- Export correctly.
+- Remain ATS-friendly.
+
+---
+
+# Future
+
+Premium themes.
+
+Marketplace.
+
+Custom templates.