Upgrade Effect to rc.112

[SandroMaglione]

Summary

• upgrade the exact Effect peer dependency from 4.0.0-rc.111 to 4.0.0-rc.112
• keep @effect/vitest, browser, and Node platform packages on the matching rc
• update installation guidance and the workspace lockfile

Changeset

• Added or updated for a library or package-metadata change
• Not required because this PR does not change a publishable package

Validation

• pnpm check
• Automated type-performance measurement passed or was not required
• Automated runtime- and memory-performance measurement passed or was not required

Local smoke tests also passed with pnpm perf:types and pnpm perf:runtime; the automated base-versus-PR comparisons remain authoritative.

[github-actions]

Type performance

Measured with TypeScript 6.0.3 and skipLibCheck=true.

Scenario	Base	PR	Difference
Effect only	55	55	0 (0.0%)
Import effect-machine	55	55	0 (0.0%)
Machine.states (3 states)	3,039	3,039	0 (0.0%)
Machine.make (3 states, 2 events)	10,787	10,787	0 (0.0%)
machine.handle (3 states, 2 transitions)	28,551	28,551	0 (0.0%)
fluent transition (10 named branches)	122,775	122,775	0 (0.0%)
fluent invocation (state-dependent Effect)	108,429	108,429	0 (0.0%)
machine.handle (depth 24)	207,970	207,970	0 (0.0%)
machine.handle (wide depth 16)	236,332	236,332	0 (0.0%)
machine.handle (parallel/history/choice)	144,812	144,812	0 (0.0%)
machine definition (3 independent implementations)	143,617	143,617	0 (0.0%)
machine exact input/output/error/services	129,873	129,873	0 (0.0%)
execution adapter readiness	136,469	136,469	0 (0.0%)

Marginal instantiations are measured against the matching setup without that API call:

Scenario	Base	PR	Difference
Import effect-machine	0	0	0
Machine.states (3 states)	2,984	2,984	0 (0.0%)
Machine.make (3 states, 2 events)	7,740	7,740	0 (0.0%)
machine.handle (3 states, 2 transitions)	17,764	17,764	0 (0.0%)
fluent transition (10 named branches)	112,498	112,498	0 (0.0%)
fluent invocation (state-dependent Effect)	99,018	99,018	0 (0.0%)
machine.handle (depth 24)	187,474	187,474	0 (0.0%)
machine.handle (wide depth 16)	217,043	217,043	0 (0.0%)
machine.handle (parallel/history/choice)	124,167	124,167	0 (0.0%)
machine definition (3 independent implementations)	127,576	127,576	0 (0.0%)
machine exact input/output/error/services	115,217	115,217	0 (0.0%)
execution adapter readiness	106,299	106,299	0 (0.0%)

Check times (informational)

Scenario	Base	PR
Effect only	0.03s	0.03s
Import effect-machine	0.03s	0.03s
Machine.states (3 states)	0.10s	0.10s
Machine.make (3 states, 2 events)	0.16s	0.16s
machine.handle (3 states, 2 transitions)	0.25s	0.27s
fluent transition (10 named branches)	0.57s	0.62s
fluent invocation (state-dependent Effect)	0.58s	0.55s
machine.handle (depth 24)	0.84s	0.81s
machine.handle (wide depth 16)	0.84s	0.85s
machine.handle (parallel/history/choice)	0.70s	0.65s
machine definition (3 independent implementations)	0.69s	0.70s
machine exact input/output/error/services	0.60s	0.64s
execution adapter readiness	0.66s	0.66s

Type instantiations are the comparison metric. Check time varies with runner load and is informational only.

[github-actions]

Runtime performance

Median of 5 independent benchmark processes on AMD EPYC 9V45 96-Core Processor with Node v24.19.0.

Pull request baseline

Scenario	Effect Machine
Plan counter transitions	208,610 transitions/s
Drain burst with terminal fence	717,657 increments/s
Drain burst with a change observer	664,793 increments/s
Lookup and send to one child	620,028 increments/s
Start and stop a machine	248,385 machines/s
Start and stop a parent with one child	74,627 families/s
Plan transitions through a compound state	183,942 transitions/s
Plan transitions through parallel regions	153,737 transitions/s
Drain burst through a compound state	556,448 events/s
Drain burst through two parallel regions	562,568 events/s
Drain a compound-state burst with a change observer	529,973 events/s

Process runtime reference points

Scenario	Effect Machine
Start and stop a raw generic process	51,073 processes/s
Start and stop a raw compiled process	115,701 processes/s

Memory profile	Effect Machine
Idle machine	1.7 KiB
Raw generic managed process	13.9 KiB
Raw compiled process	3.2 KiB
Two independent idle machines	3.3 KiB
Idle parent with one child	5.7 KiB
Parent with observed child registry	9.8 KiB
Parent with observed invoked child snapshots	6.3 KiB

Effect Machine change from base

Metric	Base	Base variability	PR	PR variability	Difference
Plan counter transitions	184,091 transitions/s	3.0% MAD	208,610 transitions/s	0.9% MAD	+13.3%
Drain burst with terminal fence	578,340 increments/s	4.3% MAD	717,657 increments/s	1.3% MAD	+24.1%
Drain burst with a change observer	559,428 increments/s	2.3% MAD	664,793 increments/s	2.7% MAD	+18.8%
Lookup and send to one child	520,698 increments/s	4.4% MAD	620,028 increments/s	2.9% MAD	+19.1%
Start and stop a machine	230,627 machines/s	1.9% MAD	248,385 machines/s	0.2% MAD	+7.7%
Start and stop a parent with one child	73,094 families/s	2.5% MAD	74,627 families/s	1.7% MAD	+2.1%
Plan transitions through a compound state	165,488 transitions/s	1.2% MAD	183,942 transitions/s	1.7% MAD	+11.2%
Plan transitions through parallel regions	135,840 transitions/s	1.3% MAD	153,737 transitions/s	1.4% MAD	+13.2%
Drain burst through a compound state	484,882 events/s	0.4% MAD	556,448 events/s	1.1% MAD	+14.8%
Drain burst through two parallel regions	482,951 events/s	3.2% MAD	562,568 events/s	0.2% MAD	+16.5%
Drain a compound-state burst with a change observer	462,059 events/s	0.0% MAD	529,973 events/s	0.5% MAD	+14.7%
Idle machine heap per unit	1.8 KiB	0.2% MAD	1.7 KiB	0.1% MAD	-1.3%
Raw generic managed process heap per unit	13.9 KiB	0.0% MAD	13.9 KiB	0.0% MAD	+0.0%
Raw compiled process heap per unit	3.2 KiB	0.1% MAD	3.2 KiB	0.4% MAD	+1.0%
Two independent idle machines heap per unit	3.4 KiB	0.0% MAD	3.3 KiB	0.0% MAD	-1.1%
Idle parent with one child heap per unit	5.8 KiB	0.0% MAD	5.7 KiB	0.0% MAD	-0.5%
Parent with observed child registry heap per unit	10.0 KiB	0.0% MAD	9.8 KiB	0.0% MAD	-2.0%
Parent with observed invoked child snapshots heap per unit	6.3 KiB	0.0% MAD	6.3 KiB	0.0% MAD	-0.5%

Process runtime reference change from base

Metric	Base	Base variability	PR	PR variability	Difference
Start and stop a raw generic process	51,154 processes/s	2.1% MAD	51,073 processes/s	2.3% MAD	-0.2%
Start and stop a raw compiled process	117,606 processes/s	1.7% MAD	115,701 processes/s	1.0% MAD	-1.6%

Regression guard

No large, noise-adjusted throughput or heap regressions detected.

Versions and interpretation

• Effect Machine: 0.25.0

Higher throughput is better; lower heap is better. Variability is the median absolute deviation across independent processes, relative to their median. Small differences on shared GitHub-hosted hardware remain informational; the required guard rejects only large changes beyond the measured noise allowance.