[AZ-220] Add shared runtime contract models

Implement the shared DTO contract surface with validation so runtime components consume one public model set instead of duplicating shapes.

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

_docs/03_implementation/batch_02_cycle1_report.md

@@ -0,0 +1,34 @@
+# Batch Report
+
+**Batch**: 2
+**Tasks**: AZ-220_shared_runtime_contracts
+**Date**: 2026-05-03
+
+## Task Results
+
+| Task | Status | Files Modified | Tests | AC Coverage | Issues |
+|------|--------|----------------|-------|-------------|--------|
+| AZ-220_shared_runtime_contracts | Done | 8 files | Pass | 2/2 ACs covered | None |
+
+## AC Test Coverage: All covered
+
+| AC Ref | Coverage |
+|--------|----------|
+| AC-1 | `test_runtime_dtos_accept_valid_minimal_values` verifies the shared DTO contract surface can be imported and constructed. |
+| AC-2 | `test_missing_required_timestamp_is_rejected_with_structured_error`, `test_raw_frame_retention_is_rejected`, `test_position_accuracy_cannot_under_report_covariance`, and `test_accepted_anchor_requires_estimated_pose` verify malformed DTOs are rejected with structured Pydantic validation errors. |
+
+## Code Review Verdict: PASS
+
+Review report: `_docs/03_implementation/reviews/batch_02_review.md`
+
+## Auto-Fix Attempts: 0
+
+## Stuck Agents: None
+
+## Verification
+
+- `.venv/bin/python -m black --check src tests e2e/replay` passed.
+- `.venv/bin/python -m ruff check src tests e2e/replay` passed.
+- `.venv/bin/python -m pytest` passed: 11 tests.
+
+## Next Batch: AZ-221_shared_geometry_time_sync, AZ-222_runtime_config_errors_telemetry

_docs/03_implementation/reviews/batch_02_review.md

@@ -0,0 +1,24 @@
+# Code Review Report
+
+**Batch**: AZ-220_shared_runtime_contracts
+**Date**: 2026-05-03
+**Verdict**: PASS
+
+## Findings
+
+| # | Severity | Category | File:Line | Title |
+|---|----------|----------|-----------|-------|
+| - | - | - | - | No findings |
+
+## Review Notes
+
+- AC-1 is satisfied by the public exports in `src/shared/contracts/__init__.py` and the DTO models in `src/shared/contracts/models.py`.
+- AC-2 is satisfied by Pydantic validation for missing required fields, raw frame retention, optimistic covariance reporting, and inconsistent anchor decisions.
+- The implementation stays inside `shared/contracts` ownership and does not introduce component-specific algorithms.
+- Raw frame payloads remain references only; the model rejects retained raw-frame payload flags.
+
+## Verification
+
+- `.venv/bin/python -m black --check src tests e2e/replay` passed.
+- `.venv/bin/python -m ruff check src tests e2e/replay` passed.
+- `.venv/bin/python -m pytest` passed: 11 tests.

_docs/_autodev_state.md

@@ -9,6 +9,6 @@ tracker: jira
 sub_step:
   phase: 1
   name: batch-loop
-  detail: "batch 1: AZ-219_initial_structure"
+  detail: "batch 2: AZ-220_shared_runtime_contracts"
 retry_count: 0
 cycle: 1