chore(graphify): CLAUDE.md 新增 graphify 使用規則

由 graphify 安裝流程寫入，要求查詢程式碼問題時先用 graphify query，
改完程式碼後執行 graphify update。

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

CLAUDE.md

@@ -213,3 +213,14 @@
 - 發現問題直接說，不要繞彎
 - 有不確定的地方，明確標注「我不確定，需要你確認」
 - 不要重複確認已經決定的技術選擇
+
+## graphify
+
+This project has a knowledge graph at graphify-out/ with god nodes, community structure, and cross-file relationships.
+
+Rules:
+- When graphify-out/graph.json exists, run `graphify query "<question>"` before your first grep, search or source-file read for a codebase question, and put this rule in every subagent prompt that explores code. Read raw files only for lines the graph or an earlier read already located. Use `graphify path "<A>" "<B>"` for relationships and `graphify explain "<concept>"` for focused concepts. These return a scoped subgraph, usually much smaller than GRAPH_REPORT.md or raw grep output.
+- If graphify-out/wiki/index.md exists, use it for broad navigation instead of raw source browsing.
+- Read graphify-out/GRAPH_REPORT.md only for broad architecture review or when query/path/explain do not surface enough context.
+- After modifying code, run `graphify update .` to keep the graph current (AST-only, no API cost).
+- A committed graphify-out/graph.json is rewritten whole on every build, so a large diff to it in a pull request is expected. Do not flag it as churn or suggest skipping the graph rebuild or its hooks.