chore: add PreToolUse hooks scaffold, gitignore graphify outputs, fix CLAUDE.md newline

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

.claude/settings.json

@@ -1,5 +1,8 @@
 {
   "enabledPlugins": {
     "kyberforge@holocron": true
+  },
+  "hooks": {
+    "PreToolUse": []
   }
-}
+}

.gitignore

@@ -24,3 +24,6 @@ node_modules/
 
 # Claude Code local settings (machine-specific)
 .claude/settings.local.json
+
+graphify-out/cost.json        # local only
+graphify-out/cache/         # optional: commit for speed, skip to keep repo small

CLAUDE.md

@@ -144,4 +144,4 @@ rtk init --global       # Add RTK to ~/.claude/CLAUDE.md
 | Network | curl, wget | 65-70% |
 
 Overall average: **60-90% token reduction** on common development operations.
-<!-- /rtk-instructions -->
+<!-- /rtk-instructions -->