ver1-step2 implemented

docs/ver1/ver1-step2-results.md

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+# Ver1 Step 2 Results: Error Handling & Reliability Hardening
+
+## Summary
+
+Step 2 implementation is complete for the planned reliability and error-handling hardening scope:
+
+1. Worker retries are now explicit, bounded, and category-driven.
+2. Error behavior is more consistent across worker/API/UI boundaries.
+3. Logging now includes stronger boundary context in key failure paths.
+4. Test coverage was expanded for retry policy and new reliability settings.
+
+## Implemented Changes
+
+### 1) Worker retry policy and terminal behavior
+
+- Updated `src/transcription/models.py`:
+  - Added `Job.retry_count` with default `0`.
+- Updated `src/transcription/config.py`:
+  - Added `worker_max_retries`.
+  - Added `worker_retry_backoff_seconds`.
+- Updated `src/transcription/worker.py`:
+  - Added bounded retry decision path (`_should_retry`).
+  - Added requeue behavior (`_requeue_for_retry`) for retriable errors.
+  - Added deterministic terminal failure behavior (`_finalize_failed_job`).
+  - Preserved transcript failure detail persistence (`error_id`, `category`, suggestion).
+
+### 2) API fallback normalization hardening
+
+- Updated `src/transcription/api/errors.py`:
+  - Fallback handler now emits safe generic internal message for unhandled exceptions.
+  - Added structured boundary logging fields including operation and exception type.
+
+### 3) UI interaction reliability guard
+
+- Updated `src/transcription/ui/upload_page.py`:
+  - Added duplicate in-flight submission guard to prevent repeated upload handling while busy.
+
+### 4) Observability/logging improvements
+
+- Updated worker logs in `src/transcription/worker.py` to include operation and domain identifiers in key transitions:
+  - pick
+  - retry
+  - transcribed
+  - failed
+
+## Test Coverage Added/Updated
+
+- Updated `tests/test_models.py`:
+  - Assert `retry_count` default.
+- Updated `tests/test_config.py`:
+  - Added worker retry settings default test.
+- Updated `tests/services/test_worker.py`:
+  - Added retriable requeue test.
+  - Added retry-exhaustion terminal failure test.
+  - Updated existing tests for settings-driven worker behavior.
+- Existing API error tests remained green with fallback behavior updates:
+  - `tests/api/test_error_responses.py`
+
+## Verification Evidence
+
+Executed and passing:
+
+- `uv run pytest tests/services/test_worker.py tests/test_models.py tests/test_config.py tests/api/test_error_responses.py -q`
+- `uv run pytest -q`
+
+## Residual Risks / Follow-ups
+
+1. Retry policy currently uses simple fixed backoff; richer strategy (exponential/jitter) can be added in later hardening.
+2. Full cross-layer structured logging standardization can be expanded in Step 6 observability work.
+3. A formal Step 2 error-path inventory artifact (`ver1-step2-audit.md`) is still recommended for governance completeness.
+
+## Step 2 Exit Assessment
+
+- Error taxonomy and envelope stability: **met**
+- Bounded retry and terminal failure behavior: **met**
+- Worker reliability controls: **met**
+- UI interaction hardening for duplicate actions: **met**
+- Test coverage expansion and full-suite regression safety: **met**
+
+Step 2 is complete and ready to hand off to Ver1 Step 3.