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/technical/coding-standards.md

@@ -0,0 +1,52 @@
+# Coding Standards
+
+## General Rules
+
+Code should be:
+
+- Readable.
+- Self documenting.
+- Consistent.
+
+---
+
+# Naming
+
+Use meaningful names.
+
+Avoid:
+
+- Short unclear variables.
+- Generic service names.
+
+---
+
+# Methods
+
+Prefer:
+
+Small focused methods.
+
+Avoid:
+
+Large methods handling multiple responsibilities.
+
+---
+
+# Error Handling
+
+Errors should:
+
+- Be handled explicitly.
+- Provide useful messages.
+- Not expose sensitive information.
+
+---
+
+# Comments
+
+Comments should explain:
+
+Why something exists.
+
+Not what the code does.