fix: move hook script to hooks.example/ to prevent self-triggering

Move refresh-semantic-diff.sh from .claude/hooks/ to
.claude/hooks.example/ so the project-level hook doesn't trigger
semantic-diff within the semantic-diff repo itself. Update README
with setup note about using global settings.

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

Author: Alan Shum

.claude/hooks/refresh-semantic-diff.sh …e/hooks.example/refresh-semantic-diff.sh.claude/hooks/refresh-semantic-diff.sh renamed to .claude/hooks.example/refresh-semantic-diff.sh .claude/hooks/refresh-semantic-diff.sh renamed to .claude/hooks.example/refresh-semantic-diff.sh

@@ -1,17 +1 @@
-{
-  "hooks": {
-    "PostToolUse": [
-      {
-        "matcher": "Edit|Write",
-        "hooks": [
-          {
-            "type": "command",
-            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/refresh-semantic-diff.sh",
-            "async": true,
-            "timeout": 10
-          }
-        ]
-      }
-    ]
-  }
-}
+{}

.claude/settings.local.json

@@ -136,16 +136,18 @@ semantic-diff is designed to work as a live diff viewer alongside Claude Code.
 
 ### Setup
 
-1. Copy the hook script:
+1. Copy the hook script (an example is provided in `.claude/hooks.example/`):
 
 ```bash
 mkdir -p ~/.claude/hooks
-cp .claude/hooks/refresh-semantic-diff.sh ~/.claude/hooks/
+cp .claude/hooks.example/refresh-semantic-diff.sh ~/.claude/hooks/
 chmod +x ~/.claude/hooks/refresh-semantic-diff.sh
 ```
 
 2. Add to your Claude Code settings (`~/.claude/settings.local.json`):
 
+> **Note:** Add this to your **global** (`~/.claude/settings.local.json`) or **user-level** settings, not the project-level `.claude/settings.local.json`. Adding it to the project settings will cause the hook to trigger within the semantic-diff repo itself, repeatedly opening new semantic-diff instances.
+
 ```json
 {
   "hooks": {