feat: Implement PDF heading hierarchy inference for category_depth#4369

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Commits on Jun 9, 2026

feat: Implement PDF heading hierarchy inference for category_depth

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fix: Address bot review feedback for PR #4369
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test: Add unit tests for PDF heading hierarchy helpers

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Commits on Jun 10, 2026

fix: Apply bbox coordinates to LTChar in test helper

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claude
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test: Add integration test for PDF heading hierarchy inference

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fix: Include nested text containers in font size collection

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