test(fix): add CRLF line-ending coverage for name-drift rewrite

[protosphinx]

Why

fix.ts uses the same \r?\n regex pattern as parse.ts to handle Windows CRLF line endings in skill files. parse.test.ts already has a CRLF test pinning that behavior, but fix.test.ts has zero CRLF coverage. If the regex in rewriteFrontmatterName regressed to \n-only, no test would catch it.

What

Three new test cases appended to test/fix.test.ts:

• fixes name-drift on a file with CRLF line endings: writes a CRLF skill file, runs applyFixes, confirms fixed === 1 and the new name appears in the rewritten content.
• preserves body line endings after fixing CRLF frontmatter: confirms the \r\n sequences in the body are untouched after the frontmatter rewrite (only the frontmatter delimiters are normalized to LF).
• skips a CRLF file when the name field is absent: confirms fixed === 0, skipped === 1 and the file is unchanged when there is no name: key to rewrite.

No source changes. Test-only.

Tests

• All three new cases exercise applyFixes via real tmpdir files, matching the pattern of the existing fix.test.ts suite.
• Existing 8 tests are unchanged.

Self-merge gate

• all CI checks pass
• LOC delta < 250 (added + removed)
• no public-API surface change
• no runtime-dependency additions
• no workflow file changes
• tests added or extended

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