🔧 chore: add prek static checks

[zrr1999]

Summary

• Add a repo-local prek.toml with shared baseline hooks for file hygiene, strict tombi (--error-on-warnings), actionlint, typos, and published hook manifest validation.
• Correct the mirror tooling direction from preserving Python 3.8 compatibility to following modern spore-lang requirements: Python 3.13+, modern SPDX license metadata, and setuptools>=77.
• Make sync automation request Python 3.13 via astral-sh/setup-uv and uv run --python 3.13 --script sync.py.

Validation

• uv build
• uvx tombi lint --error-on-warnings pyproject.toml prek.toml
• uvx prek run --all-files
• uvx prek validate-manifest .pre-commit-hooks.yaml
• git diff --check

Notes

• Kept this PR scoped to spore-pre-commit to avoid overlapping active cross-repo PRs.
• Did not run uv run --python 3.13 --script sync.py locally because the script can tag, push, and create GitHub releases as part of its normal behavior.

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[zrr1999]

Corrected the PR direction per the approved plan:

• Dropped Python 3.8 compatibility and set both project/script metadata to Python 3.13+.
• Switched packaging metadata to license = "MIT" with setuptools>=77.
• Restored strict tombi linting with --error-on-warnings.
• Updated sync workflow to use Python 3.13 through setup-uv and uv run --python 3.13 --script sync.py.
• Documented that hook environments follow the mirrored spore-lang Python requirement (currently 3.13+).

Validation passed: uv build, uvx tombi lint --error-on-warnings pyproject.toml prek.toml, uvx prek run --all-files, uvx prek validate-manifest .pre-commit-hooks.yaml, and git diff --check.

Skipped local uv run --python 3.13 --script sync.py because it can tag/push/create releases.