Heuristic E: narrow + structured error carrier (per TIER1_REVIEW_phase9_dilemma_20260620):
- except (NarrowType): return ErrorInfo(...) -> INTERNAL_COMPLIANT
- except (NarrowType): <item>["error"] = True -> INTERNAL_COMPLIANT
Distinguishes from the empty-default pattern (args = {}, body = ...) which
is explicitly NOT a drain per error_handling.md:528-531.
Refactored L332, L355 except bodies:
Was: except (ValueError, AttributeError): body = exc.response.text
Now: except (ValueError, AttributeError) as e: return ErrorInfo(...)
The function still returns ErrorInfo either way. When JSON parse fails,
we can't classify specific error codes, so we return UNKNOWN with the
original exception preserved (drain: structured ErrorInfo, not lost-default).
Added 2 helper methods:
_has_errorinfo_return(stmts) -> bool
_has_dict_error_true_assign(stmts) -> bool
Tests: 41 pass (28 baseline + 13 audit heuristics including the original 8).
Audit: ai_client UNCLEAR 6 -> 4 (L332+L355 now BOUNDARY_CONVERSION).
Remaining UNCLEAR: L394, L716, L723, L994 (will migrate in subsequent commits).
ed
efe0637a92