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/research/market-positioning.md

@@ -0,0 +1,53 @@
+# Market Positioning
+
+## Current Market
+
+Most tools focus on:
+
+CV creation.
+
+or
+
+Job tracking.
+
+---
+
+# Jobjakt Position
+
+Combine:
+
+Job tracker
+
++
+
+Career profile
+
++
+
+AI assistance
+
++
+
+Application workflow
+
+---
+
+# Target User
+
+Someone actively searching for work.
+
+They need:
+
+Organisation.
+
+Better documents.
+
+Better applications.
+
+Less stress.
+
+---
+
+# Long Term Vision
+
+A personal career operating system.