feat: make /afk command and permission hook globally available

Changed from per-project to global installation by default, making
InnerVoice features available across all projects automatically.

Global Installation:
- /afk slash command now in ~/.claude/commands/afk.md
- Permission hook now in ~/.claude/hooks/PermissionRequest.sh
- Both work in ALL projects without per-project setup

Install Script Updates:
- Added --global flag for global installation (recommended)
- Still supports per-project installation if needed
- Clear scope indication in output messages
- Updated uninstall instructions for both scopes

Documentation:
- Updated README to recommend global installation
- Added examples for both global and per-project setup
- Clearer uninstall instructions for each scope

Benefits:
- Users install once, works everywhere
- No per-project configuration needed
- Easier maintenance and updates
- Consistent behavior across all projects

Breaking Changes: None
- Per-project installation still supported
- Existing installations continue to work

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/install-hook.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Install the InnerVoice permission notification hook in a project
+# Install the InnerVoice permission notification hook globally or per-project
 
 set -e
 
@@ -7,12 +7,22 @@ HOOK_NAME="PermissionRequest.sh"
 INNERVOICE_DIR="$(cd "$(dirname "$0")/.." && pwd)"
 SOURCE_HOOK="$INNERVOICE_DIR/hooks/$HOOK_NAME"
 
-# Get target project directory (default to current directory)
-TARGET_DIR="${1:-.}"
-TARGET_HOOK_DIR="$TARGET_DIR/.claude/hooks"
+# Check for --global flag
+if [ "$1" = "--global" ] || [ "$1" = "-g" ]; then
+  TARGET_HOOK_DIR="$HOME/.claude/hooks"
+  SCOPE="globally (all projects)"
+  UNINSTALL_CMD="rm ~/.claude/hooks/$HOOK_NAME"
+else
+  # Get target project directory (default to current directory)
+  TARGET_DIR="${1:-.}"
+  TARGET_HOOK_DIR="$TARGET_DIR/.claude/hooks"
+  SCOPE="in project: $TARGET_DIR"
+  UNINSTALL_CMD="rm $TARGET_HOOK_DIR/$HOOK_NAME"
+fi
 
 echo "📦 Installing InnerVoice Permission Notification Hook"
 echo ""
+echo "Scope:  $SCOPE"
 echo "Source: $SOURCE_HOOK"
 echo "Target: $TARGET_HOOK_DIR/$HOOK_NAME"
 echo ""
@@ -35,4 +45,4 @@ echo ""
 echo "🔔 Now when you're in AFK mode, you'll get Telegram notifications"
 echo "   whenever Claude requests permission for a tool."
 echo ""
-echo "To uninstall: rm $TARGET_HOOK_DIR/$HOOK_NAME"
+echo "To uninstall: $UNINSTALL_CMD"