Executes docs/superpowers/specs/2026-07-07-runtime-performance-pass-design.md:
- database.rs: every pooled connection now runs WAL + synchronous=NORMAL
+ busy_timeout=5000 + foreign_keys=ON via with_init (in-memory pools
get the latter two). Fixes the SQLITE_BUSY failure mode under the
parallel scanner and makes FK cascades work on every connection, not
just whichever one last ran the old one-shot pragma in delete_folder.
- database.rs: prepare_cached for the per-video info_cache queries; new
info_cache_put_many bulk upsert (single transaction) replaces the
per-row autocommitted info_cache_put, with a round-trip unit test.
- library.rs: enrich_with_cache collects cache misses and flushes them
once per channel; title sort uses sort_by_cached_key.
- app.rs: Title/ChannelAsc sorts use sort_by_cached_key instead of
allocating two lowercased strings per comparison.
- Cargo.toml: panic=abort in release (crash-hook still fires; Cargo
forces unwind for test harnesses). PACKAGING.md documents the local
RUSTFLAGS target-cpu=native opt-in; repo stays portable.
- .gitignore: catacomb.db-wal / catacomb.db-shm sidecars.
Verified: 146 tests pass (integration suite exercises the pragmas
end-to-end), x86_64-pc-windows-gnu check green, live smoke shows
journal_mode=wal + batched cache writes landing correct rows.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
