[AZ-447] autodev Steps 1-4 baseline: docs, tests, refactor specs

Captures the full output of autodev existing-code Phase A through
Step 4 (Code Testability Revision) for the Azaion UI workspace:

- Step 1 Document: _docs/02_document/ (FINAL_report, architecture,
  glossary, components/, modules/, diagrams/, system-flows,
  module-layout) plus _docs/00_problem/ + _docs/01_solution/ +
  _docs/legacy/ + _docs/how_to_test + README.
- Step 2 Architecture Baseline: architecture_compliance_baseline.md.
- Step 3 Test Spec: _docs/02_document/tests/ (environment,
  test-data, blackbox/performance/resilience/security/
  resource-limit tests, traceability-matrix), enum_spec_snapshot,
  expected_results/results_report.md (98 rows), plus the
  run-tests.sh + run-performance-tests.sh runners.
- Step 4 Code Testability Revision: 01-testability-refactoring/
  run dir (list-of-changes C01-C07, deferred_to_refactor,
  analysis/research_findings + refactoring_roadmap) and the 7
  child task specs AZ-448..AZ-454 under _docs/02_tasks/todo/
  plus _dependencies_table.md.
- _docs/_autodev_state.md pins the cursor at Step 4 / refactor
  Phase 4 entry so /autodev resumes cleanly.

Epic AZ-447 (UI testability gates) tracks the 7 child tasks that
will land in subsequent commits.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/_autodev_state.md

@@ -0,0 +1,27 @@
+# Autodev State
+
+## Current Step
+flow: existing-code
+step: 4
+name: Code Testability Revision
+status: in_progress
+sub_step:
+  phase: 2
+  name: refactor-phase-2-tasks-review-gate
+  detail: "epic AZ-447 + 7 tasks AZ-448..AZ-454 created"
+retry_count: 0
+cycle: 1
+step_4_5_glossary_vision: confirmed
+step_2_baseline_routing: per-finding-recommended (option A)
+step_3_results_report_authoring: agent (option A)
+step_3_ac_gap_handling: rollback-to-6c (option A)
+
+## Notes
+- Phase A baseline cycle. Step 1 (Document) complete; see
+  `_docs/02_document/state.json`, `FINAL_report.md`, `architecture.md`,
+  `glossary.md`, plus `_docs/01_solution/solution.md` and
+  `_docs/00_problem/{problem,acceptance_criteria,restrictions,security_approach}.md`.
+- Suite-level architecture: `../_docs/`. UI design: `_docs/ui_design/`.
+- Legacy reference: `_docs/legacy/wpf-era.md` + research copy at
+  `suite/annotations-research` (detached @ `22529c2`).
+- /document scope was src/ AND mission-planner/ (two disjoint groups).