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

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_notes/.obsidian/plugins/templater-obsidian/manifest.json

@@ -0,0 +1,11 @@
+{
+    "id": "templater-obsidian",
+    "name": "Templater",
+    "version": "2.18.1",
+    "description": "Create and use templates",
+    "minAppVersion": "1.5.0",
+    "author": "SilentVoid",
+    "authorUrl": "https://github.com/SilentVoid13",
+    "helpUrl": "https://silentvoid13.github.io/Templater/",
+    "isDesktopOnly": false
+}