chore: sync vault to ~/cosmic-brain (Obsidian-registered path)

skills/wiki/references/git-setup.md

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+# Git Setup
+
+Initialize git in the vault to get full history and protect against bad writes.
+
+---
+
+## Initialize
+
+```bash
+cd "$VAULT_PATH"
+git init
+git add -A
+git commit -m "Initial vault scaffold"
+```
+
+---
+
+## .gitignore
+
+The root `.gitignore` in this repo already covers the right exclusions:
+
+```
+.obsidian/workspace.json
+.obsidian/workspace-mobile.json
+.smart-connections/
+.obsidian-git-data
+.trash/
+.DS_Store
+```
+
+`workspace.json` changes constantly as you move panes around. Excluding it keeps the diff clean.
+
+---
+
+## Obsidian Git Plugin
+
+After installing the plugin (see `plugins.md`):
+
+Settings > Obsidian Git:
+- Auto backup interval: **15 minutes**
+- Auto backup after file change: on
+- Push on backup: on (if you have a remote)
+- Commit message: `vault: auto backup {{date}}`
+
+This runs silently in the background. You get a full history of every note without thinking about it.
+
+---
+
+## Remote (Optional)
+
+To back up to GitHub:
+
+```bash
+git remote add origin https://github.com/yourname/your-vault
+git push -u origin main
+```
+
+Keep the repo private if the vault contains personal notes.