typing: introduce sensible basedpyright defaults

[Byron]

That way it dosesn't all light up immediately in dev mode.

Tasks

• refackiew

[Copilot]

Pull request overview

This PR adds a basedpyright configuration to the repository and makes a set of targeted typing adjustments in git/util.py to reduce type-checker noise while keeping the project’s existing Python 3.7 baseline.

Changes:

• Add [tool.basedpyright] defaults in pyproject.toml (standard mode, Python 3.7, and exclusions for the gitdb submodule).
• Refine/strengthen a number of type annotations in git/util.py (e.g., Callable, BinaryIO, generics).
• Adjust expand_path implementation typing/behavior to be more type-checker-friendly.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
pyproject.toml	Introduces baseline basedpyright settings to avoid immediate dev-mode noise.
git/util.py	Updates several annotations and a few typing-related behaviors to align with static analysis expectations.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

[Byron]

🤦‍♂️ Terra Light

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You’re correct. I made the wrong call.
At 05:27:08 UTC, GitHub merged it while the test matrix was queued/running. I used gh pr merge --auto, assuming it would wait for every displayed check; GitHub only waits for checks configured as required by branch protection. These weren’t required, so auto-merge merged immediately.
I should have waited for the full check rollup to complete successfully before issuing any merge command.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.