initial: hyprpanel-state plugin

Hooks-only Claude Code plugin that surfaces per-window claude state
in the patched HyprPanel workspaces bar. Wires UserPromptSubmit /
PreToolUse / PostToolUse / Notification / Stop / SessionEnd to a
shell script that walks the parent-PID chain to find the kitty
client whose claude this script lives in, then writes a state token
to /tmp/hyprpanel-claude/<address>.

Bar visuals are owned separately by the workspaces patch in
projects/hyprpanel-dev. The contract between the two is the
/tmp/hyprpanel-claude/ directory layout (state file, .tools
counter, .ping sidecar for blink-decay animations).

.gitignore

@@ -0,0 +1 @@
+.claude/