Fix jagged GFM table round-trip by not padding short rows

[BetterAndBetterII]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)
• If applicable, or if asked for, I added adequate tests
• If applicable, or if asked for, I added documentation
• If applicable, or if asked for, I updated package.json for relevant changes (versions, scripts, etc)

Description of changes

Parsing a GFM table with short body rows, then stringifying and re-parsing, padded those rows to the header width. markdown-table always emits a rectangle, so a later parse saw extra empty cells and the AST drifted.

After markdown-table runs, drop the padded cells so stringify keeps each row’s real cell count. Header and delimiter rows stay at header width. Tests cover the issue fixtures (a|| / || / ||||||) plus a jagged aligned table and escaped pipes in cells.

Fixes #8.

[github-actions]

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