chore: gitignore .swarm/ + ruvector.db (Claude Code local artifacts)

之前 M1.2 telemetry commit 不小心把 cypher-executor/src/.swarm/ 跟 ruvector.db
commit 進去。這些是 Claude Code 自己的本地工具產物，不該入庫。

- 加 .gitignore 樣式：.swarm/ / ruvector.db / **/.swarm/ / **/ruvector.db
- 撤回上次 commit 進去的 5 個檔案

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -9,3 +9,9 @@ credentials.yaml
 
 # macOS
 .DS_Store
+
+# Local AI tooling artifacts (Claude Code swarm + ruvector)
+.swarm/
+ruvector.db
+**/.swarm/
+**/ruvector.db

cypher-executor/.gitignore

@@ -0,0 +1,4 @@
+
+# Local AI tooling artifacts
+.swarm/
+ruvector.db