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/jobs/job-lifecycle.md

@@ -0,0 +1,91 @@
+# Job Lifecycle
+
+## Purpose
+
+Defines how a job progresses through Jobjakt.
+
+---
+
+# Discovery
+
+User finds opportunity.
+
+Sources:
+
+- Manual entry.
+- Job URL.
+- Future job search integrations.
+
+Status:
+
+Interested.
+
+---
+
+# Preparation
+
+User decides to apply.
+
+Actions:
+
+- Review job details.
+- Prepare CV.
+- Prepare cover letter.
+- Gather documents.
+
+Status:
+
+Preparing.
+
+---
+
+# Application
+
+User submits application.
+
+Track:
+
+- Date applied.
+- Documents used.
+- Method.
+
+Status:
+
+Applied.
+
+---
+
+# Interview
+
+Track:
+
+- Interview dates.
+- Interview type.
+- Notes.
+- Preparation.
+
+Status:
+
+Interview.
+
+---
+
+# Outcome
+
+Possible states:
+
+Offer.
+
+Rejected.
+
+Withdrawn.
+
+Accepted.
+
+---
+
+# Important
+
+The workflow should remain flexible.
+
+Different industries have different hiring processes.