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/career-profile.md

@@ -0,0 +1,94 @@
+
+# Career Profile
+
+## Purpose
+
+The Career Profile is the user's professional source of truth.
+
+---
+
+# Information Stored
+
+## Personal Information
+
+- Name.
+- Professional title.
+- Contact information.
+- Location.
+- Profile photo.
+
+---
+
+## Experience
+
+Contains:
+
+- Company.
+- Role.
+- Dates.
+- Description.
+- Achievements.
+- Technologies.
+
+---
+
+## Education
+
+Contains:
+
+- Institution.
+- Qualification.
+- Dates.
+- Details.
+
+---
+
+## Skills
+
+Contains:
+
+- Technical skills.
+- Soft skills.
+- Proficiency.
+
+---
+
+## Projects
+
+Contains:
+
+- Name.
+- Description.
+- Technologies.
+- Outcomes.
+
+---
+
+## Certifications
+
+Contains:
+
+- Certification.
+- Provider.
+- Date.
+
+---
+
+## Languages
+
+Contains:
+
+- Language.
+- Level.
+
+---
+
+# User Control
+
+Users must be able to:
+
+- Edit manually.
+- Add information.
+- Remove information.
+
+AI assists but never becomes the source of truth.