fix: number ordered list items in sequence

[ocavuebot]

The editor showed an ordered list as 1, 2, 3, but the Markdown output wrote every new item as 1.. The serializer now takes the start number from the first item of a list and counts up, and the parser keeps order only on that first item, so a parse after a serialize gives the same tree. checkRoundTrip reports a renumbered list as normalizing.

Fixes #694

[github-actions]

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commit: a00b49d

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1 Skipped Deployment

Project	Deployment	Actions	Updated
meowdown	Ignored		Oct 12, 2026 12:13pm UTC

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.57%	5825 / 6159
🔵	Statements	92.4%	6580 / 7121
🔵	Functions	92.67%	1430 / 1543
🔵	Branches	88.73%	4522 / 5096

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/converters/sample-content.ts	100%	100%	100%	100%
packages/markdown/src/ast/check-roundtrip.ts	94.11%	86.66%	100%	93.93%	72, 81
packages/markdown/src/ast/parse.ts	97.82%	91.03%	100%	98.89%	303-306, 392, 405, 984, 993
packages/markdown/src/ast/serialize.ts	94.86%	92.32%	100%	96.63%	82, 180, 234-235, 264-268, 284, 324-325, 418-419, 438, 449, 486, 578, 635, 697, 763, 897, 983
packages/markdown/src/ast/types.ts	0%	0%	0%	0%

Generated in workflow #2748 for commit a00b49d by the Vitest Coverage Report Action