Add bounded audit all orchestration

[Widthdom]

Summary

• add cdidx audit --all over one authoritative, ordinally sorted recipe-registry snapshot, with shared filters and explicit per-recipe/query attribution
• bound cross-recipe execution by per-query/global rows, incremental JSON/NDJSON bytes, cancellation, and deadline while preserving failure/omission accounting and partial-result exit semantics
• interrupt active SQLite reads for scoped query deadlines, keep interactive progress on stderr, and emit bounded filter-preserving recovery commands with omission metadata
• document the English and Japanese contracts and add focused cross-target regression coverage

Validation

• dotnet build CodeIndex.sln -c Release --no-restore — passed with 0 warnings and 0 errors
• focused Release audit-all/SQLite-interrupt/progress tests — 11/11 passed on both net8.0 and net9.0
• broad CliFlagSchemaTests|ConsoleUiTests|DbReaderTests regression set — 1008/1008 passed on net8.0; 1007 passed and 1 expected skip on net9.0
• dotnet test CodeIndex.sln -c Release --no-restore — net9.0: 11,740 passed, 435 skipped, 0 failed; net8.0: 12,228 passed, 9 skipped, with one unrelated allocation-comparison test failing by 136 bytes under parallel load; that exact Release test passed 1/1 when rerun alone
• dotnet run --project tools/CodeIndex.Changelog -- check — validated all 14 fragments
• root status --check — fresh and matched; workspace status --check — 2/2 members healthy
• two Codex adversarial-review rounds completed; all blocking/actionable findings were addressed

Documentation and changelog

• updated the English and Japanese USER_GUIDE.md sections
• updated the English and Japanese test ownership guidance in TESTING_GUIDE.md
• added/updated changelog.d/unreleased/5238.added.md

Follow-up candidates

None.

Fixes #5238