feat(markdown): use LF offsets for AST positions

[ocavuebot]

This PR keeps the single \r\n to \n conversion at the start of parseMarkdownAst, and removes the code that mapped every position back onto the \r\n source. Positions now index the text with \n line endings, which is the same as the source for a host that passes \n text.

A host that stores notes with \r\n should convert them once where it reads the file, so the rest of its code and this library share one coordinate system.

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Project	Deployment	Actions	Updated
meowdown	Ignored		Oct 4, 2026 8:10am UTC

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📥 Commits

Reviewing files that changed from the base of the PR and between adde824 and 0a0b7e0.

📒 Files selected for processing (6)

• .changeset/markdown-lf-positions.md
• packages/core/src/converters/paragraph.ts
• packages/markdown/README.md
• packages/markdown/src/ast/check-roundtrip-fuzz.test.ts
• packages/markdown/src/ast/parse.ts
• packages/markdown/src/ast/position.test.ts

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commit: 0a0b7e0

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.54%	5757 / 6089
🔵	Statements	92.33%	6504 / 7044
🔵	Functions	92.59%	1414 / 1527
🔵	Branches	88.77%	4443 / 5005

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/converters/paragraph.ts	100%	100%	100%	100%
packages/markdown/src/ast/parse.ts	97.76%	90.68%	100%	98.86%	277-280, 366, 379, 958, 967

Generated in workflow #2641 for commit 0a0b7e0 by the Vitest Coverage Report Action