Follow-up (#377): add AC3 byte-identical result test for --weights on text+--ast path

[dean0x]

Context

#377 added --weights inert-notice handling. Review confirmed the core fix is correct but flagged that AC3 — results byte-identical between e.g. --weights 0.5,0.3,0.2 and --weights 0.5,0.3,9.9 on the text+--ast path — is currently proven only indirectly (notice-fires test + zero-weights AC5 test).

Definition of done

Add a direct execute_query comparison test asserting two temporal-differing weight invocations produce identical result sets on the text+--ast compound path.

Origin: #377. Refs #174.

[dean0x]

Resolved in fe6ffda (PR #386 → wave/wave4-search): direct byte-identity test for compound --weights on the text+--ast path. CI-green.

[dean0x]

Resolved in PR #386 (merged to wave/wave4-search @ ea99703): targeted test/perf hardening + #380 Phase 2 positional search. Not yet on main — ships with PR #368 (wave→main).