* fix: restore tree-sitter-swift postinstall patch for macOS ARM64
PR #516 (77dcb06) deleted `scripts/patch-tree-sitter-swift.cjs` and
the `postinstall` script entry when bumping to `tree-sitter-swift@0.7.1`,
since 0.7.1 ships prebuilt darwin-arm64 binaries and no longer needs the
patch. PR #538 (01ddc3e) then had to revert `tree-sitter-swift` back to
`^0.6.0` (and `tree-sitter` back to `^0.21.1`) because `npm overrides`
doesn't apply when gitnexus is installed via `npx -y` (gitnexus isn't the
root project, so overrides are silently ignored, producing ERESOLVE errors).
PR #538 reverted the grammar package changes but did not restore the patch
script, leaving `tree-sitter-swift@0.6.0` unable to build its native
binding on macOS ARM64. The symptom is `gitnexus analyze` printing
"Skipping swift" or "swift parser not available".
`Dockerfile.test` still references `node scripts/patch-tree-sitter-swift.cjs`
(added in the same PR #516), confirming the regression — the test image
build is also broken.
This commit restores the patch script from commit `0c8ec95` (the last
revision before it was deleted) and re-adds the `postinstall` entry to
`package.json`. No logic changes — it is an exact restoration.
The TODO comment in the script ("Remove this script when tree-sitter is
upgraded to ^0.22.x") still applies.
* style: run prettier on patch-tree-sitter-swift.cjs
9364739fb4