feat(rag): hybrid FTS+vector retrieval and multi-format ingestion — name-your-tool questions find the right document

tests/fixtures/docs/homelab/ssh/ssh_aliases.txt

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+SSH notes for the homelab jump host.
+
+All admin hosts are reachable through the jump box at 10.0.1.2
+(`ssh reese@jump`). The `~/.ssh/config` aliases:
+
+k3s — the kubernetes control plane node (10.0.1.10, user talos)
+gitlab — the gitlab container host (10.0.1.14)
+nuc — the low-power media box (10.0.1.20)
+
+Keys: ed25519 per host, no passwords. The old RSA key was retired in
+2025 and its line removed from authorized_keys on every host.
+
+Forwarding X11 stays off everywhere; use `ssh -L` port forwards for the
+occasional GUI tool instead.