Add Knowledge Hub books FTS and remove training UI (0.16.0).

Index Assistent/books search.jsonl, expose knowledge hops/catalog in chat, and drop QLoRA/HF training stack.

Co-authored-by: Cursor <cursoragent@cursor.com>

Config/_base/skills/knowledge.md

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+# Knowledge skill
+
+Attached **books** are read-only FTS corpora (Civitai prompts, RU fic style, …). They are **not** mutable memory.
+
+## When to search
+
+- User asks for reference prompts, scene wording, style/tone, or «как на Civitai».
+- You need concrete tag/prompt patterns before generating.
+
+## How to search (server hop)
+
+```json
+{ "ask": ["knowledge"], "knowledge_query": "redhead stockings cinematic window light" }
+```
+
+Optional: `knowledge_rating` (`pg`, `pg13`, …). Legacy `ask:["examples"]` + `example_query` still works for Civitai-only.
+
+## Rules
+
+- **Remix** — never paste long verbatim from books.
+- Pure chat / opinions: **prose only**, no JSON.
+- Do **not** emit `generate:true` on knowledge Q&A turns.