fix(hooks): export skip-worktree entries into the pre-commit snapshot

[paustint]

Summary

The pre-commit hook exports the index with git checkout-index --all. By default, that command skips entries with the skip-worktree bit set, which a sparse checkout or git update-index --skip-worktree sets. Those files never reached the snapshot, so they escaped both oxfmt and oxlint. --ignore-skip-worktree-bits exports every index entry.

The hook is shared verbatim, and the other three copies get the same one-flag change, so all four stay byte-identical:

• fix(hooks): check the whole codebase as staged in pre-commit simple-excel#12
• fix(hooks): check the whole codebase as staged in pre-commit sf-formula-parser#71
• fix(hooks): check the whole codebase as staged in pre-commit soql-parser-js#303

No CHANGELOG entry, since nothing under src/ changed.

Test plan

• Hook passes on a clean index
• With the new flag, a staged, unformatted file marked skip-worktree and removed from disk blocks the commit; the old hook let it through (tested in simple-excel, where the hook is byte-identical)

[Copilot]

🟢 Approval recommended

The focused change correctly handles sparse index entries and remains synchronized across repositories.

0 open findings

What changed in this PR

Updates the pre-commit snapshot to include skip-worktree entries, ensuring sparse-checkout files are formatted and linted.

Changes:

• Exports all index entries with --ignore-skip-worktree-bits.
• Documents the sparse-checkout behavior.
• Keeps all four shared hook copies identical.

File	Description
.githooks/​pre-commit	Includes skip-worktree files in the validation snapshot.

🧠 Review effort: Balanced

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