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/profile.md

@@ -0,0 +1,59 @@
+# Profile Experience
+
+## Purpose
+
+Separate personal account information from career information.
+
+---
+
+# Account Profile
+
+Contains:
+
+- Profile picture.
+- Name.
+- Username.
+- Email.
+- Password.
+- Security settings.
+
+---
+
+# Career Profile
+
+Separate area.
+
+Contains:
+
+- Experience.
+- Skills.
+- Education.
+- Projects.
+- Certifications.
+- Languages.
+
+---
+
+# CV Builder
+
+The CV builder should not live directly inside profile.
+
+Recommended:
+
+Career
+
+↓
+
+Master CV
+
+↓
+
+Builder
+
+---
+
+# Important Rule
+
+A user's account profile is not their professional profile.
+
+Keep these separate.