React huge document full benchmark

Objective: Create one canonical huge-document benchmark target that runs the existing core, React, browser-trace, virtualized, and overlay owners without duplicating their measurement logic.

Completion threshold: Done when react-huge-document-full exists in the target registry, emits react_huge_doc_full_max_budget_ratio plus supporting METRIC lines, writes a stable aggregate artifact, and passes target check, target dry-run, script syntax check, and a benchmark execution.

Verification surface:

• node --check .tmp/slate-v2/scripts/benchmarks/browser/react/huge-document-full.mjs
• pnpm bench:targets:check
• pnpm bench:targets:dry-run -- react-huge-document-full
• HUGE_DOC_FULL_SMOKE=1 bun run bench:react:huge-document:full:local

Constraints:

• Keep the existing benchmark owners authoritative.
• Do not move benchmark state into .tmp/slate-v2 permanently; this checkout is still the live lab boundary before the future Plate merge.
• Do not commit, push, or open a PR.

Boundaries:

• Source of truth: .tmp/slate-v2/scripts/benchmarks/**, .tmp/slate-v2/package.json, benchmarks/targets/slate-v2.json, and this plan.
• Non-goals: no product runtime optimization, no pagination UI work, no old Evidence Kit rewrite.

Blocked condition: Block only if the existing benchmark owners cannot run even in smoke mode, or if target dry-run cannot initialize Autoresearch for the new target.

Start Gates:

Gate	Applies	Evidence
Active goal	yes	Created goal for the full huge-document benchmark target.
Source owners read	yes	Read existing core, React legacy compare, browser trace, Slate browser trace, overlay, package script, and target registry surfaces.
Commit/PR requested	no	No commit, push, staging, or PR requested.

Work Checklist:

• Existing huge-document benchmark owners inspected.
• Full wrapper added without duplicating benchmark internals.
• Package script added.
• Target registry entry added.
• Verification commands run and evidence recorded.

Completion Gates:

Gate	Applies	Evidence
Script syntax	yes	node --check .tmp/slate-v2/scripts/benchmarks/browser/react/huge-document-full.mjs passed.
Target registry	yes	pnpm bench:targets:check passed with 27 targets; pnpm bench:targets:report --check passed.
Target dry-run	yes	pnpm bench:targets:dry-run -- react-huge-document-full passed with autoresearchSetupOk=true.
Benchmark execution	yes	Smoke and full 5k packet passed; full packet emitted react_huge_doc_full_max_budget_ratio=3.82, react_huge_doc_full_failure_count=0, and react_huge_doc_full_virtualized_type_to_paint_p95_ms=30.
Product behavior	no	Benchmark tooling only.

Phase / pass table:

Phase	Status	Evidence
implementation	complete	Wrapper, script entry, target entry, report artifacts, benchmark execution, and correctness gate are complete.

Verification evidence:

• node --check .tmp/slate-v2/scripts/benchmarks/browser/react/huge-document-full.mjs passed.
• pnpm bench:targets:check passed with 27 targets.
• pnpm bench:targets:report --check passed after regenerating target report/history.
• pnpm bench:targets:dry-run -- react-huge-document-full passed with zero missing required artifacts and autoresearchSetupOk=true.
• HUGE_DOC_FULL_SMOKE=1 HUGE_DOC_FULL_SKIP_BROWSER_BUILD=1 bun run bench:react:huge-document:full:local passed and wrote the smoke aggregate artifact.
• HUGE_DOC_FULL_SKIP_BROWSER_BUILD=1 bun run bench:react:huge-document:full:local passed and wrote the full 5k aggregate artifact with failureCount=0, maxBudgetRatio=3.82, legacyCompareWorstP95Ratio=0.69, typeToPaintP95Ms=286.7, and virtualizedTypeToPaintP95Ms=30.
• bun check passed in .tmp/slate-v2; lint reported one existing warning in site/examples/ts/pagination.tsx.

Reboot status: The canonical full target is react-huge-document-full. Use pnpm bench:targets:run react-huge-document-full for the build-inclusive target path, or HUGE_DOC_FULL_SKIP_BROWSER_BUILD=1 bun run bench:react:huge-document:full:local in .tmp/slate-v2 when site/out already exists.

Open risks: The full target can be expensive because the browser trace owner builds the Next static site. The current full metric is dominated by non-virtualized browser type-to-paint (286.7ms, budget ratio 3.82), while virtualized type-to-paint is within budget at 30ms.