refactor!: rename project to bot-bottle

Assisted-by: Codex

bot_bottle/backend/util.py

@@ -0,0 +1,18 @@
+"""Cross-backend utility helpers — host-side primitives shared by
+every backend implementation. Backend-specific helpers live one level
+deeper (e.g. bot_bottle/backend/docker/util.py)."""
+
+from __future__ import annotations
+
+import os
+
+from ..log import die
+
+
+def host_skill_dir(name: str) -> str:
+    """Return the host-side path for a named skill:
+    `$HOME/.claude/skills/<name>`. Dies if HOME is unset."""
+    home = os.environ.get("HOME")
+    if not home:
+        die("HOME not set")
+    return f"{home}/.claude/skills/{name}"