fix(deps): add tomli fallback for Python <3.11

`tomllib` is stdlib only in Python 3.11+. On Python 3.9/3.10 (and the
macOS runner) the scanner's toml parsing returned empty, so manifest
lookups for `pyproject.toml` / `Cargo.toml` produced no name. CI
surfaced this via 4 test_project_scanner.py failures on the 3.9 matrix.

Add `tomli>=2.0.0` as a conditional dependency for `python_version <
'3.11'` and fall back to it in `project_scanner.py`. The project still
declares `requires-python = ">=3.9"` so the fallback is the correct
shape.

mempalace/project_scanner.py

@@ -28,6 +28,9 @@ from typing import Optional
 try:
     import tomllib  # Python 3.11+
 except ImportError:  # pragma: no cover
+    try:
+        import tomli as tomllib  # Python 3.9/3.10 backport
+    except ImportError:
         tomllib = None  # type: ignore
 
 
@@ -130,7 +133,7 @@ def _parse_toml(path: Path) -> dict:
     try:
         with open(path, "rb") as f:
             return tomllib.load(f)
-    except (OSError, Exception):
+    except (OSError, tomllib.TOMLDecodeError):
         return {}
 
 

pyproject.toml

@@ -29,6 +29,7 @@ classifiers = [
 dependencies = [
     "chromadb>=1.5.4,<2",
     "pyyaml>=6.0,<7",
+    "tomli>=2.0.0; python_version < '3.11'",
 ]
 
 [project.urls]