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/overview.md

@@ -0,0 +1,87 @@
+# Career Workspace Overview
+
+## Purpose
+
+The Career Workspace is a supporting feature of Jobjakt.
+
+It helps users maintain their professional identity and create career outputs.
+
+The primary product remains job tracking.
+
+The Career Workspace exists to make applications easier and more effective.
+
+---
+
+# Core Concept
+
+Users maintain one professional source of truth:
+
+Career Profile
+
+↓
+
+Master CV
+
+↓
+
+CV Builder
+
+↓
+
+Tailored Applications
+
+↓
+
+Career Outputs
+
+---
+
+# Outputs
+
+The Career Workspace can generate:
+
+- Standard CV.
+- Job-specific CV.
+- Cover letters.
+- Portfolio.
+- Public profile.
+- LinkedIn summaries.
+- Interview preparation.
+
+---
+
+# Important Rule
+
+Do not create separate disconnected CV profiles.
+
+The user has:
+
+ONE career identity.
+
+Many possible outputs.
+
+---
+
+# Architecture Principle
+
+Career data should not contain presentation information.
+
+Example:
+
+Career Profile:
+
+"Worked as Software Engineer at Company X"
+
+Theme:
+
+"Modern Professional"
+
+Output:
+
+"PDF CV"
+
+---
+
+# Product Goal
+
+The user should enter information once and reuse it everywhere.