feat: add CJK bigram tokenization for Chinese/Japanese/Korean search

Merge remote-tracking branch 'origin/master'

feat(rerank,fsfs,runtime): propagate raw reranker logits, implement config set/reset, and add WAL compaction on shutdown

feat(lexical): add conversation_id field to cass schema; fix: use git dep for asupersync

chore(deps): switch asupersync to local path dependency and refine error formatting

refactor(embed,lexical,rerank): extract map_lock_error helpers and handle PolledAfterCompletion explicitly

perf(fusion): parallelize embedding and lexical search with rayon::join; add poll_immediate for sync-in-async futures

perf(fusion): replace filter+collect with in-place retain for negation filtering

perf(fusion,index): compute in_both_sources inline during RRF insertion and pre-screen WAL hashes in search

ci: trigger fresh run with 90-minute timeout

fix(ci): increase Quality job timeout from 60 to 90 minutes

fix: add tempfile dev-dependency for interaction_unit tests

fix(tests): use tempdir for interaction_unit test index

fix(ops): widen write latency budget for CI runner variability

fix(storage): correct snapshot isolation test for WAL mode semantics