search_sessions_by_id previously fetched up to 10k sessions via
list_sessions_rich and filtered them in Python — O(n) per keystroke.
Push the id match into SQL instead.
- list_sessions_rich gains an optional id_query param: a case-insensitive
LIKE pushed into the outer WHERE, matched against each surfaced row's id
AND every id in its forward compression chain (via the existing chain
CTE). Searching a compression root id or a tip id both resolve to the
same projected conversation. LIKE wildcards in the needle are escaped.
- search_sessions_by_id now fetches only matching rows (limit*4) and ranks
exact > prefix > substring in Python over that small set.
- web_server /api/sessions/search: route ID matches and content matches
through one lineage-keyed dedup helper so an id-hit and a content-hit on
the same conversation collapse to a single result (the contributor's
version keyed ID hits by raw sid and content hits by root, which could
double-list a compression tip).
- command-center haystack also matches _lineage_root_id for parity.
E2E verified against a real DB: exact match over 3000+ sessions
materializes 1 row in Python (was ~3000), 5ms; root-id resolves to tip;
LIKE-wildcard escaping holds.
Follow-up to @0xharryriddle's feat(desktop): search sessions by id.
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