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/settings.md

@@ -0,0 +1,88 @@
+# Settings Experience
+
+## Purpose
+
+Settings should allow users to manage their account and application preferences.
+
+---
+
+# Structure
+
+Recommended tabs:
+
+## General
+
+Contains:
+
+- Appearance.
+- Language.
+- Preferences.
+
+Remove unnecessary complexity.
+
+---
+
+## Account
+
+Contains:
+
+- Name.
+- Email.
+- Password.
+- Security.
+
+---
+
+## Connected Accounts
+
+Contains:
+
+Email providers:
+
+- Gmail.
+- Microsoft.
+- IMAP.
+
+Future:
+
+- Other integrations.
+
+---
+
+## AI Settings
+
+Contains:
+
+- AI provider selection.
+- Usage settings.
+- Model preferences.
+
+Admin controls should remain restricted.
+
+---
+
+## Notifications
+
+Contains:
+
+- Email notifications.
+- Follow-up reminders.
+- Application alerts.
+
+---
+
+# Rules
+
+Normal users should not see:
+
+- System management.
+- Import/export administration.
+- Infrastructure controls.
+
+---
+
+# UX Goal
+
+Settings should feel like a normal modern application.
+
+Not an admin panel.