refactor(painter): deliver resolved items to decoration provider callback

[tupizz]

PR Stack (SD-2563: Dumb Painter Refactor)

#	PR	Title	Status
1	#2810	Lift page metadata into ResolvedPage
2	#2811	Lift fragment metadata into resolved paint items
3	#2812	Pre-compute SDT container keys in resolved layout
4	#2813	Pre-compute paragraph border data in resolved layout
5	#2814	Move change detection into resolved layout stage
6	#2818	Lift paragraph/list block and measure into resolved items
7	#2819	Extract block/measure resolution helper
8	#2820	Remove body blocks/measures from DomPainterInput
9	#2826	Add resolveHeaderFooterLayout helper
10	#2827	Deliver resolved items to decoration provider callback	👈 this PR
11	#2828	Remove blockLookup — painter reads only resolved data
12	#2829	Delete dead hash helpers after blockLookup removal

[linear]

SD-2563 Painter refactor: clear inputs/outputs - "dumb" painter

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[chatgpt-codex-connector]

Normalize resolved item coordinates with shifted fragments

When layoutMinY < 0, this branch shifts fragment coordinates (y: f.y - layoutMinY) but returns items unchanged. After this refactor, renderer.renderFragment prefers resolvedItem.y (via applyResolvedFragmentFrame), so non-anchored header/footer fragments are positioned using stale pre-normalization Y values while the rest of the decoration math uses normalized fragment coordinates. In documents where header/footer content extends above y=0, this causes visible vertical misplacement/clipping; the same mismatch is also present in the variant fallback branch.

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