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/ai/cv-ai.md

@@ -0,0 +1,58 @@
+# CV AI Features
+
+## Purpose
+
+Improve CV creation.
+
+---
+
+# Features
+
+## Improve Writing
+
+Example:
+
+Original:
+
+"Worked on websites"
+
+AI:
+
+"Developed and maintained customer-facing web applications."
+
+---
+
+## Suggest Content
+
+AI can suggest:
+
+- Missing skills.
+- Better wording.
+
+---
+
+## Rewrite
+
+Options:
+
+- More professional.
+- More concise.
+- More technical.
+
+---
+
+## Generate
+
+Create:
+
+- Summary.
+- Bullet points.
+- Sections.
+
+---
+
+# Rules
+
+AI suggestions require approval.
+
+Never overwrite original content.