fix: use full path to claude for keybind compatibility

The keybind environment doesn't have linuxbrew in PATH.
Using full path /home/linuxbrew/.linuxbrew/bin/claude fixes it.

- pa-launch: new simplified script for keybind use
- pa-mode: updated to use full path too

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

automation/pa-mode

@@ -3,6 +3,7 @@
 set -euo pipefail
 
 SESSION_NAME="pa"
+CLAUDE="/home/linuxbrew/.linuxbrew/bin/claude"
 HISTORY_DIR="$HOME/.claude/state/personal-assistant/history"
 INDEX_FILE="$HISTORY_DIR/index.json"
 
@@ -40,11 +41,15 @@ create_or_attach_session() {
         record_session_start "$session_id"
     fi
 
-    # Export for status line, then exec tmux (replaces this shell process)
-    # Using -A: attach if session exists, create if not
+    # Export env vars for the tmux session
     export CLAUDE_AGENT=personal-assistant
+    export PA_SESSION_ID="$session_id"
+    export PA_HISTORY_FILE="$history_file"
+
+    # Using -A: attach if session exists, create if not
+    # exec replaces this shell with tmux
     exec tmux new-session -A -s "$SESSION_NAME" -c "$HOME" \
-        "CLAUDE_AGENT=personal-assistant PA_SESSION_ID='$session_id' PA_HISTORY_FILE='$history_file' claude --dangerously-skip-permissions --agent personal-assistant"
+        "$CLAUDE" --dangerously-skip-permissions --agent personal-assistant
 }
 
 case "${1:-}" in