feat(lexer): implement CommonMark tab expansion (§2.1)#39
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Expand tabs to 4-column stops before indent detection so mixed space+tab prefixes correctly trigger indented code blocks (spec ex 1–2). Fix PATTERN_HORIZONTAL_RULE to allow tab-separated thematic break chars (spec ex 11). Preserve internal tabs in code block content via stripLeadingColumns. Fix blockquote inner content to keep trailing spaces so hard line breaks survive re-tokenisation.
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Expand tabs to 4-column stops before indent detection so mixed space+tab prefixes correctly trigger indented code blocks (spec ex 1–2). Fix PATTERN_HORIZONTAL_RULE to allow tab-separated thematic break chars (spec ex 11).
Preserve internal tabs in code block content via stripLeadingColumns.
Fix blockquote inner content to keep trailing spaces so hard line breaks survive re-tokenisation.