feat: make branch scope graftable, not reusable

[pedrobslisboa]

No description provided.

[vercel]

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Project	Deployment	Actions	Updated
server-reason-react	Ready	Preview	Sep 1, 2026 1:01am UTC

[github-actions]

Benchmarks

Comparison against main (4223a9d). Higher is better.

Benchmark	main (ops/sec)	PR (ops/sec)	Change
trivial/renderToStaticMarkup	2,483,306	2,408,443	-3.0%
trivial/renderToString	2,164,020	2,164,132	+0.0%
depth/10	62,645	61,627	-1.6%
depth/25	24,812	24,508	-1.2%
depth/50	12,643	12,318	-2.6%
depth/100	6,373	6,030	-5.4% 🔴
width/10	38,754	35,540	-8.3% 🔴
width/100	4,018	3,825	-4.8%
width/500	741.46	726.56	-2.0%
width/1000	374.03	361.03	-3.5%
table/10	25,543	25,064	-1.9%
table/50	5,463	5,306	-2.9%
table/100	2,344	2,288	-2.4%
table/500	505.73	497.21	-1.7%
props/small	10,052	10,071	+0.2%
props/medium	3,494	3,487	-0.2%
props/large	1,184	1,189	+0.4%
realworld/ecommerce24	6,395	6,378	-0.3%
realworld/ecommerce48	3,401	3,388	-0.4%
realworld/dashboard	26,712	26,918	+0.8%
realworld/blog50	4,104	4,130	+0.6%
realworld/form	13,696	13,743	+0.3%
primitive/React.string	18,444,609	18,117,944	-1.8%
primitive/React.int	8,397,005	8,109,637	-3.4%
primitive/React.null	25,497,289	26,886,564	+5.4% 🟢
primitive/createElement_empty	10,570,323	11,034,738	+4.4%
primitive/createElement_children	917,510	926,693	+1.0%
primitive/React.array_10	866,323	894,785	+3.3%
primitive/React.array_100	95,164	96,209	+1.1%
primitive/React.list_10	879,346	897,677	+2.1%
primitive/React.list_100	93,730	94,550	+0.9%
rsc/trivial	316,862	316,838	-0.0%
rsc/depth/50	4,809	4,867	+1.2%
rsc/width/100	500.67	506.15	+1.1%
rsc/width/500	89.77	90.44	+0.7%
rsc/width/1000	41.77	41.01	-1.8%
rsc/table/100	253.97	240.24	-5.4% 🔴
rsc/table/500	46.54	46.62	+0.2%
streaming/renderToStream/wide100	3,563	3,599	+1.0%
streaming/renderToStream/suspense-drained	37,119	36,917	-0.5%
rsc/render_html/wide100	505.11	507.84	+0.5%
rsc/render_html/suspense	15,007	15,219	+1.4%
rsc/render_model/wide100	1,047	1,039	-0.7%
router/match/static-small-first	19,484,325	19,372,334	-0.6%
router/match/static-small-last	28,574,701	28,599,600	+0.1%
router/match/static-large-first	28,362,051	29,510,753	+4.1%
router/match/static-large-last	27,501,370	28,948,610	+5.3% 🟢
router/match/static-large-miss	2,654,637	2,594,763	-2.3%
router/match/dynamic-large-first	1,808,526	1,739,419	-3.8%
router/match/dynamic-large-last	2,004,398	1,967,340	-1.8%
router/endpoint/static-large-last	15,312,087	16,044,789	+4.8%
router/endpoint/dynamic-large-last	1,828,261	1,789,824	-2.1%
router/parse/path-plain	1,899,092	1,840,885	-3.1%
router/parse/path-encoded	1,291,237	1,297,743	+0.5%
router/parse/search	2,337,995	2,383,319	+1.9%

_{Changes within ±5% are likely noise from the CI runner.}