2f3e3e7363
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Any item shared between headingTitleItem and document-level item causes a shift/reduce conflict: the LALR automaton merges the two contexts and makes the shared token ambiguous. The only structural fix is to make HeadingTitle a terminal (external tokenizer) that reads greedily to EOL, giving the LR state machine a context-isolated token that can never collide with document-level item tokens. Removes headingTitleItem sub-rule, HeadingText token, and updates styleTags to match HeadingTitle directly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>