fix(win32): handle CRLF line endings in markdown frontmatter parsing

[Hona]

Summary

• Frontmatter parser split on \n which fails on Windows where files have \r\n — changed to split on /\r?\n/ so field extraction works cross-platform.
• Test assertion for markdown header content also normalized to handle \r\n.

Fixes 16 Windows unit test failures. Split out from #14742.

[Copilot]

Pull request overview

This PR fixes a Windows-specific bug in markdown frontmatter parsing where CRLF line endings (\r\n) caused field extraction to fail. The fix changes the split logic from a literal string split on \n to a regex split on /\r?\n/ that handles both Unix (LF) and Windows (CRLF) line endings. Additionally, a test assertion that checks multi-line markdown content is updated to normalize CRLF before comparison.

Changes:

• Modified frontmatter parsing to handle CRLF line endings cross-platform
• Updated test assertion to normalize line endings for multi-line content comparison

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/opencode/src/config/markdown.ts	Changed frontmatter line splitting from .split("\n") to .split(/\r?\n/) to handle both Unix and Windows line endings
packages/opencode/test/config/markdown.test.ts	Added .replace(/\r\n/g, "\n") normalization to test assertion for multi-line markdown content to handle CRLF

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