chore: upgrade React experimental to 0.0.0-experimental-fef12a01-20260413

[react-server-bot]

Automated daily upgrade of React packages to the latest experimental version.

Previous version: 0.0.0-experimental-705268dc-20260409
New version: 0.0.0-experimental-fef12a01-20260413

Updated locations

• packages/react-server/package.json — react, react-dom, react-is, react-server-dom-webpack
• package.json — all pnpm.overrides for React
• docs/ — micro-frontends MDX (en + ja) esm.sh URLs
• pnpm-lock.yaml

Smoke test

• Dev mode — hello world test passed ✅
• Build+start mode — hello world test passed ✅

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Status	Name	Latest Commit	Updated (UTC)
🔵 In progress View logs	react-server-docs	161d6c3	Apr 14 2026, 06:38 AM

[github-actions]

⚡ Benchmark Results

	PR 161d6c3	main 464b5a5
Config	50 connections, 10s/test	50 connections, 10s/test

Benchmark	Req/s	vs main	Avg Latency	vs main	P99 Latency	Throughput
minimal	1200	⚪ -0.2%	41.16 ms	⚪ +0.2%	84 ms	0.7 MB/s
small	1306	⚪ -0.3%	37.7 ms	⚪ +0.2%	64 ms	1.2 MB/s
medium	330	⚪ -0.4%	150.13 ms	🔴 +1.1%	213 ms	4.8 MB/s
large	30	🔴 -7.8%	1490.67 ms	⚪ -1.0%	2689 ms	3.0 MB/s
deep	884	🟢 +4.2%	55.99 ms	🟢 -3.9%	91 ms	2.9 MB/s
wide	43	🟢 +9.7%	1141.1 ms	🟢 -2.9%	2197 ms	2.3 MB/s
cached	3400	🟢 +1.1%	14.27 ms	⚪ -0.9%	31 ms	49.6 MB/s
client-min	439	⚪ -0.4%	113.09 ms	⚪ +0.7%	172 ms	2.2 MB/s
client-small	455	🟢 +1.0%	108.85 ms	🟢 -1.3%	169 ms	2.5 MB/s
client-med	357	🟢 +2.6%	139.31 ms	🟢 -2.3%	207 ms	6.8 MB/s
client-large	85	🟢 +3.6%	558.39 ms	🟢 -5.3%	1118 ms	9.0 MB/s
client-deep	423	🔴 -1.6%	116.63 ms	🔴 +1.2%	166 ms	3.3 MB/s
client-wide	138	🔴 -1.5%	360.31 ms	🔴 +3.0%	635 ms	8.1 MB/s
static-json	6915	🟢 +3.9%	6.7 ms	🟢 -4.8%	16 ms	2.9 MB/s
static-js	7198	🟢 +10.9%	6.33 ms	🟢 -12.8%	16 ms	8.6 MB/s
404-miss	4871	🟢 +1.1%	9.67 ms	🟢 -1.3%	22 ms	0.6 MB/s
hybrid-min	454	🟢 +2.2%	109.39 ms	🟢 -1.6%	177 ms	2.5 MB/s
hybrid-small	428	⚪ -0.8%	116.14 ms	🔴 +1.6%	170 ms	2.8 MB/s
hybrid-medium	192	🔴 -1.4%	254.49 ms	🔴 +1.4%	398 ms	8.6 MB/s
hybrid-large	25	🟢 +4.1%	1816.38 ms	🟢 -1.9%	3955 ms	8.5 MB/s
hybrid-deep	336	⚪ +0.1%	148.39 ms	⚪ +0.7%	225 ms	5.0 MB/s
hybrid-wide	31	⚪ 0.0%	1421.45 ms	⚪ +0.8%	2356 ms	6.8 MB/s
hybrid-cached	2875	🟢 +2.0%	16.89 ms	🟢 -1.9%	31 ms	128.8 MB/s
hybrid-client-min	466	🔴 -2.2%	106.55 ms	🔴 +2.8%	155 ms	2.4 MB/s
hybrid-client-small	466	🔴 -2.8%	106.51 ms	🔴 +3.1%	155 ms	2.6 MB/s
hybrid-client-medium	347	🔴 -3.7%	142.25 ms	🔴 +3.5%	208 ms	6.7 MB/s
hybrid-client-large	86	🟢 +2.4%	561.57 ms	🟢 -2.3%	1008 ms	9.1 MB/s
hybrid-client-deep	441	🟢 +3.6%	112.5 ms	🟢 -3.2%	163 ms	3.5 MB/s
hybrid-client-wide	139	🔴 -2.3%	352.99 ms	🔴 +3.2%	528 ms	8.2 MB/s

Legend

🟢 > 1% improvement | 🔴 > 1% regression | ⚪ within noise margin

Benchmarks run on GitHub Actions runners (shared infrastructure) — expect ~5% variance between runs. Consistent directional changes across multiple routes are more meaningful than any single number.