Fall back to FTS5/LIKE keyword search when Chroma is disabled

[Copilot]

When CLAUDE_MEM_CHROMA_ENABLED=false, search requests with a query parameter fail with a misleading error about installing uv, rather than using the already-available FTS5 infrastructure for keyword matching.

Changes

• SessionSearch: Add FTS5 keyword search path (with LIKE fallback when FTS5 unavailable) to searchObservations, searchSessions, searchUserPrompts. Add hasFtsTables() (cached) and sanitizeFtsQuery() helpers.
• SQLiteSearchStrategy: Pass query text through to SessionSearch instead of always passing undefined.
• SearchOrchestrator: PATH 3 (query + no Chroma) now delegates to SQLite strategy with query instead of returning empty results.
• SearchManager: Legacy path uses FTS5/LIKE fallback instead of setting chromaFailed=true.

Search resolution order when Chroma is unavailable

query provided + Chroma disabled
  → FTS5 MATCH (if observations_fts/session_summaries_fts exist)
    → LIKE fallback (if FTS5 query fails or tables missing)

User prompts use LIKE directly (no FTS5 table exists for user_prompts).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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