chore: simplify .gitignore for personal vault, add plugins

Cleaned up .gitignore (removed upstream author-specific entries, added
.claude/ and excalidraw main.js). Track installed Obsidian plugins:
dataview, templater, obsidian-git, local-rest-api.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1,21 +1,17 @@
 # Obsidian
-# workspace.json is intentionally tracked — ships with pre-configured graph view
-# .obsidian/workspace.json
+.obsidian/workspace.json
 .obsidian/workspace-mobile.json
 .obsidian/plugins/*/data.json
-!.obsidian/plugins/calendar/data.json
-!.obsidian/plugins/thino/data.json
-
-# Excalidraw main.js is 8MB — downloaded by setup-vault.sh, not tracked in git
-.obsidian/plugins/obsidian-excalidraw-plugin/main.js
-
-# Large binary assets — add your own images to _attachments/images/
-# Uncomment the line below to exclude images from git (recommended for large vaults)
-# _attachments/images/
-.smart-connections/
 .obsidian-git-data
+.smart-connections/
 .trash/
 
+# Claude Code
+.claude/
+
+# Obsidian - large plugin binaries
+.obsidian/plugins/obsidian-excalidraw-plugin/main.js
+
 # System
 .DS_Store
 Thumbs.db
@@ -28,62 +24,18 @@ __pycache__/
 # Node
 node_modules/
 
-# Local secrets
+# Secrets
 .env
 .env.local
-*.local.md
 
-# Personal files dropped into vault root by Obsidian (don't commit these)
-WIKI*.md
-PROMPT.md
-Welcome.md
+# Scratch / temp
 *.tmp.*
-Obsidian vault*
 Untitled.canvas
-Cosmic Brain*.gif
-Cosmic Brain*.png
 Untitled *.canvas
 Untitled.base
-*.base
-# Track our committed dashboard.base (Bases dashboard shipped with the vault)
-!wiki/meta/dashboard.base
 
-# Scratch canvases and personal vault files
-Banana Images.canvas
-Demo Images.canvas
-*Images.canvas
-
-# Daily notes created by Calendar plugin
-????-??-??.md
-
-# Video and large media files
+# Large media (track in git-lfs or keep out entirely)
 *.mkv
 *.mp4
 *.mov
 *.avi
-
-# Transcripts (copyright — do not commit)
-*Trascipt*.txt
-*Transcript*.txt
-
-# Personal images dropped in vault root
-cosmic code.png
-_attachments/code-genesis.png
-_attachments/neural-voyager.png
-_attachments/the-frontier.png
-
-# Excalidraw drawings (personal, user-specific)
-Excalidraw/
-
-# Loose brand/personal GIFs and images in vault root (not _attachments/)
-Claude SEO*.gif
-Claude SEO*.png
-
-# Private Skool Hub assets — not for public repos
-_attachments/images/skool-hub/
-
-# Archive of old versions (cosmic-brain, GIF assets)
-claude-obsidian-archive/
-
-# User-specific attachments
-_attachments/