docs: refine skills

skills/brave-search/SKILL.md

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+---
+name: brave-search
+description: Headless web search and content extraction via Brave Search scripts.
+metadata: {"clawdis":{"requires":{"bins":["search.js","content.js"]}}}
+---
+
+# brave-search
+
+Use `search.js` and `content.js` from `~/agent-tools/brave-search` (PATH).
+
+Search
+- `search.js "query"`
+- `search.js "query" -n 10`
+- `search.js "query" --content`
+
+Extract content
+- `content.js https://example.com/article`
+
+Notes
+- No browser required; results come from Brave Search HTML.
+- If commands are missing, add `~/agent-tools/brave-search` to PATH and install deps.