chore: remove vibe-coding artifacts from tracking, sync notes and obsidian config

- Untrack .claude/launch.json (Claude Code config)
- Add .claude/, .mcp.json, CLAUDE.md, and AI-generated CSVs to .gitignore
- Add _notes/ vault (architecture, API, tasks, bugs, infra docs)
- Add .obsidian/ plugin/vault config (workspace state excluded)
- Sync CHANGELOG.md

_notes/.obsidian/plugins/dataview/manifest.json

@@ -0,0 +1,11 @@
+{
+  "id": "dataview",
+  "name": "Dataview",
+  "version": "0.5.68",
+  "minAppVersion": "0.13.11",
+  "description": "Complex data views for the data-obsessed.",
+  "author": "Michael Brenan <blacksmithgu@gmail.com>",
+  "authorUrl": "https://github.com/blacksmithgu",
+  "helpUrl": "https://blacksmithgu.github.io/obsidian-dataview/",
+  "isDesktopOnly": false
+}