* fix(memory): add LIKE fallback when FTS5 MATCH throws and log silent search errors
When searchKeyword FTS5 MATCH fails (e.g. unicode61 tokenizer rejects
certain query patterns), the search now falls back to a LIKE-based query
instead of silently returning zero results. The four .catch(() => [])
sites in the search orchestrator now log warnings so failures are
visible in diagnostics.
Fixes#74036
* fix(memory): split LIKE fallback into per-token clauses and log MATCH errors