fix(version): fall back to pyproject in source checkouts

Keep importlib.metadata as the primary source for installed packages, but avoid PackageNotFoundError when nanobot is imported directly from a source tree.

Made-with: Cursor

nanobot/__init__.py

@@ -2,9 +2,29 @@
 nanobot - A lightweight AI agent framework
 """
 
-from importlib.metadata import version as _pkg_version
+from importlib.metadata import PackageNotFoundError, version as _pkg_version
+from pathlib import Path
+import tomllib
 
-__version__ = _pkg_version("nanobot-ai")
+
+def _read_pyproject_version() -> str | None:
+    """Read the source-tree version when package metadata is unavailable."""
+    pyproject = Path(__file__).resolve().parent.parent / "pyproject.toml"
+    if not pyproject.exists():
+        return None
+    data = tomllib.loads(pyproject.read_text(encoding="utf-8"))
+    return data.get("project", {}).get("version")
+
+
+def _resolve_version() -> str:
+    try:
+        return _pkg_version("nanobot-ai")
+    except PackageNotFoundError:
+        # Source checkouts often import nanobot without installed dist-info.
+        return _read_pyproject_version() or "0.1.5"
+
+
+__version__ = _resolve_version()
 __logo__ = "🐈"
 
 from nanobot.nanobot import Nanobot, RunResult