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40a60e63d6
All 3 run_tier4_* functions had the same pattern:
try: ... AI call ...
except Exception as e: return '[XXX FAILED] {e}' (or None)
Per TIER1_REVIEW: empty-default return = MIGRATE to Result[T].
New helpers:
- _run_tier4_analysis_result(stderr: str) -> Result[str]
Returns Result(data=analysis) on success, Result(data='', errors=[ErrorInfo])
on SDK failure. Empty stderr short-circuits to Result(data='').
- _run_tier4_patch_callback_result(stderr: str, base_dir: str) -> Result[Optional[str]]
Returns Result(data=patch) on valid diff, Result(data=None) when no
valid diff, Result(data=None, errors=[ErrorInfo]) on SDK failure.
- _run_tier4_patch_generation_result(error: str, file_context: str) -> Result[str]
Returns Result(data=patch) on success, Result(data='', errors=[ErrorInfo])
on SDK failure. Empty error short-circuits to Result(data='').
Legacy wrappers delegate to _result helpers and return result.data,
preserving original signatures (str for sites 7,9; Optional[str] for site 8).
Existing tier4 tests pass (13/13 in test_tier4_patch_generation +
test_tier4_interceptor).
Audit: ai_client BC 3 -> 0. All 9 Phase 10 BC sites migrated.