feat(rag): lite-model document summaries — non-markdown docs summarized at import, summary chunk retrieves and resolves to the full source doc

tests/fixtures/summary_kb/notes/qwen-llamacpp-notes.md

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+# Qwen 3.8 on llama.cpp — deployment notes
+
+## Optimal parameters
+
+The optimal parameters for qwen 3.8 on llama.cpp came out of a week of
+benchmarks on the homelab GPU. Context length, flash attention and the
+batch size matter more than the mmap knob. The full flag set lives in
+`quadlet/qwen-llamacpp.yaml` — the yaml is the source of truth, these
+notes are the reasoning behind each picked value.
+
+## What changed since last month
+
+Switched the server image to the 0.1.43 release and moved the model
+files to the NVMe cache drive. Pinned the quant to q4_k_m; the repeat
+penalty is the knob that kept the rambles honest. The webui now fronts
+the raw server so chat sessions survive a container restart.