fix(windows): keep generated skills and snapshots LF (#25972)

Pin generated skill JSON and Vitest snapshots to LF so Windows autocrlf checkouts pass byte-for-byte verification. Cover the checkout behavior with a real Git regression test.

Co-authored-by: Shuhei Konno <shuhei.konno@gmail.com>

.gitattributes

@@ -97,3 +97,7 @@
 
 # Generated ACP schemas are checked byte-for-byte against formatted output.
 /src/main/acp/generated/*.generated.ts linguist-generated=true text eol=lf
+# Generated skill bundle artifacts are verified byte-for-byte against fresh output.
+/resources/skills/*.json linguist-generated=true text eol=lf
+# Vitest writes snapshots with LF, so checkout bytes must match on every host.
+**/__snapshots__/*.snap text eol=lf

config/scripts/generated-artifact-line-ending-pin.test.mjs

@@ -0,0 +1,49 @@
+import { execFileSync } from 'node:child_process'
+import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { dirname, join, resolve } from 'node:path'
+import { expect, it } from 'vitest'
+
+const projectDir = resolve(import.meta.dirname, '../..')
+
+it('keeps byte-compared artifacts and source LF in an autocrlf checkout', () => {
+  const root = mkdtempSync(join(tmpdir(), 'orca-line-ending-checkout-'))
+  const lf = 'first\nsecond\n'
+  const crlf = 'first\r\nsecond\r\n'
+  const paths = new Map([
+    ['resources/skills/current-manifest.json', lf],
+    ['resources/skills/snapshot-registry.json', lf],
+    ['resources/skills/release-mapping.json', lf],
+    ['src/main/__snapshots__/example.test.ts.snap', lf],
+    ['src/renderer/src/example.tsx', lf],
+    ['src/main/example.ts', lf],
+    ['config/scripts/example.mjs', lf],
+    ...['cmd', 'bat', 'ps1', 'nsh'].map((extension) => [`config/example.${extension}`, crlf]),
+    ['resources/skills-extra/example.json', crlf],
+    ['vendor/resources/skills/example.json', crlf],
+    ['scripts/example.mjs', crlf],
+    ['src/main/runtime/__fixtures__/example.txt', crlf],
+    ['src/main/daemon/__fixtures__/pty-transcripts/example.txt', crlf]
+  ])
+  const git = (args) => execFileSync('git', args, { cwd: root, stdio: 'pipe' })
+
+  try {
+    git(['init', '--quiet'])
+    writeFileSync(join(root, '.gitattributes'), readFileSync(join(projectDir, '.gitattributes')))
+    for (const path of paths.keys()) {
+      mkdirSync(dirname(join(root, path)), { recursive: true })
+      writeFileSync(join(root, path), path.includes('__fixtures__') ? crlf : lf)
+    }
+    git(['-c', 'core.autocrlf=input', 'add', '--', '.'])
+    for (const path of paths.keys()) {
+      rmSync(join(root, path))
+    }
+    git(['-c', 'core.autocrlf=true', 'checkout-index', '--all', '--force'])
+
+    for (const [path, expected] of paths) {
+      expect(readFileSync(join(root, path), 'utf8'), path).toBe(expected)
+    }
+  } finally {
+    rmSync(root, { recursive: true, force: true })
+  }
+})