Hybrid semantic + BM25 search over the user's configured corpus: notes, docs, repo docs + README + CHANGELOG, recent git commits, session transcripts, and source code (TS/JS/Python/Shell) from the configured repos. Returns top-K chunks with path:line + symbol + repo citations. Auto-scopes to the current repo when cwd is inside one — pass scope_repos=['all'] to disable. Use instead of grep for fuzzy or cross-file recall.

Semantic search over the knowledge layer — durable notes and decisions: memory notes, ADRs, plans, session handoffs, and standards (NOT source code or git commits). Cross-project by design (searches all repos, no cwd auto-scoping). Use for 'what did we decide / is there a note about X / did we hit this before'. For source-code or git-commit recall, use rag_query instead.