Pixi and Uv match()/parse() use pyproject "tools" key instead of "tool"

[jezdez]

pixi.py:63,71 and uv.py:163,186 read self.proj.pyproject.get("tools", ...) (plural). PEP 518 defines the table as [tool.<name>] (singular), and every other spec in projspec uses "tool". The same Uv class even uses the singular "tool" correctly at line 166, making the typo unambiguous.

Effect: a pyproject.toml with only [tool.pixi.workspace] (or [tool.uv]) is never matched. The standalone manifest paths (pixi.toml, uv.lock, uv.toml, .python-version) mask this.

Repro:

import tempfile, os, projspec
d = tempfile.mkdtemp()
with open(os.path.join(d, "pyproject.toml"), "w") as f:
    f.write('[tool.pixi.workspace]\nname="x"\nchannels=["conda-forge"]\nplatforms=["linux-64"]\n')
print("pixi" in projspec.Project(d))   # False, expected True

Four-line s/"tools"/"tool"/ fix. Happy to send a PR if useful.

(Noticed while preparing #91. The documentation.py:172 use of cfg.get("build", {}).get("tools", {}).get("python") is correct — that reads RTD's .readthedocs.yaml, where build.tools.python is the actual key — and is not part of this bug.)

[martindurant]

Yes, please send a PR!

[martindurant]

Fixed in #94