Remove repository examples

[SandroMaglione]

Summary

• remove the platformer, playground, and Pokémon example packages
• remove example discovery and checks from CI and simplify the change classifier
• remove example links and maintenance instructions
• retain the stronger core coverage already exercising the examples’ statechart, runtime, testing, reactivity, and lifecycle semantics

Changeset

• Added or updated for a library or package-metadata change
• Not required because this PR does not change src/ or package.json

Validation

• pnpm check
• Automated type-performance measurement passed
• Automated runtime- and memory-performance measurement passed

[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)	10,759	10,759	0 (0.0%)
machine.handle (3 states, 2 transitions)	28,192	28,192	0 (0.0%)
fluent transition (10 named branches)	106,006	106,006	0 (0.0%)
fluent invocation (state-dependent Effect)	92,756	92,756	0 (0.0%)
machine.handle (depth 24)	192,588	192,588	0 (0.0%)
machine.handle (wide depth 16)	220,950	220,950	0 (0.0%)
machine.handle (parallel/history/choice)	128,393	128,393	0 (0.0%)
machine definition (3 independent implementations)	127,346	127,346	0 (0.0%)
machine exact input/output/error/services	113,924	113,924	0 (0.0%)
execution adapter readiness	120,586	120,586	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)	7,712	7,712	0 (0.0%)
machine.handle (3 states, 2 transitions)	17,433	17,433	0 (0.0%)
fluent transition (10 named branches)	95,757	95,757	0 (0.0%)
fluent invocation (state-dependent Effect)	83,491	83,491	0 (0.0%)
machine.handle (depth 24)	171,892	171,892	0 (0.0%)
machine.handle (wide depth 16)	201,461	201,461	0 (0.0%)
machine.handle (parallel/history/choice)	108,130	108,130	0 (0.0%)
machine definition (3 independent implementations)	111,377	111,377	0 (0.0%)
machine exact input/output/error/services	99,413	99,413	0 (0.0%)
execution adapter readiness	90,770	90,770	0 (0.0%)

Check times (informational)

Scenario	Base	PR
Effect only	0.03s	0.05s
Import effect-machine	0.03s	0.03s
Machine.states (3 states)	0.11s	0.10s
Machine.make (3 states, 2 events)	0.17s	0.19s
machine.handle (3 states, 2 transitions)	0.26s	0.26s
fluent transition (10 named branches)	0.55s	0.52s
fluent invocation (state-dependent Effect)	0.50s	0.50s
machine.handle (depth 24)	0.79s	0.83s
machine.handle (wide depth 16)	0.82s	0.83s
machine.handle (parallel/history/choice)	0.65s	0.64s
machine definition (3 independent implementations)	0.65s	0.64s
machine exact input/output/error/services	0.59s	0.60s
execution adapter readiness	0.59s	0.60s

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 9V74 80-Core Processor with Node v24.19.0.

Pull request baseline

Scenario	Effect Machine
Plan counter transitions	113,639 transitions/s
Drain burst with terminal fence	333,026 increments/s
Drain burst with a change observer	312,329 increments/s
Lookup and send to one child	281,884 increments/s
Start and stop a machine	138,485 machines/s
Start and stop a parent with one child	41,345 families/s
Plan transitions through a compound state	98,855 transitions/s
Plan transitions through parallel regions	81,890 transitions/s
Drain burst through a compound state	275,266 events/s
Drain burst through two parallel regions	281,887 events/s
Drain a compound-state burst with a change observer	262,556 events/s

Process runtime reference points

Scenario	Effect Machine
Start and stop a raw generic process	26,325 processes/s
Start and stop a raw compiled process	65,950 processes/s

Memory profile	Effect Machine
Idle machine	1.8 KiB
Raw generic managed process	13.9 KiB
Raw compiled process	3.2 KiB
Two independent idle machines	3.4 KiB
Idle parent with one child	5.8 KiB
Parent with observed child registry	10.0 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	114,082 transitions/s	1.2% MAD	113,639 transitions/s	0.6% MAD	-0.4%
Drain burst with terminal fence	334,216 increments/s	0.8% MAD	333,026 increments/s	0.1% MAD	-0.4%
Drain burst with a change observer	313,187 increments/s	0.1% MAD	312,329 increments/s	0.3% MAD	-0.3%
Lookup and send to one child	287,807 increments/s	1.5% MAD	281,884 increments/s	0.5% MAD	-2.1%
Start and stop a machine	139,063 machines/s	0.6% MAD	138,485 machines/s	0.4% MAD	-0.4%
Start and stop a parent with one child	41,261 families/s	0.5% MAD	41,345 families/s	0.8% MAD	+0.2%
Plan transitions through a compound state	99,966 transitions/s	0.1% MAD	98,855 transitions/s	1.2% MAD	-1.1%
Plan transitions through parallel regions	83,280 transitions/s	1.1% MAD	81,890 transitions/s	0.8% MAD	-1.7%
Drain burst through a compound state	275,762 events/s	0.7% MAD	275,266 events/s	0.3% MAD	-0.2%
Drain burst through two parallel regions	282,836 events/s	0.5% MAD	281,887 events/s	0.4% MAD	-0.3%
Drain a compound-state burst with a change observer	263,429 events/s	1.6% MAD	262,556 events/s	1.5% MAD	-0.3%
Idle machine heap per unit	1.8 KiB	0.1% MAD	1.8 KiB	0.0% MAD	-0.1%
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	0.3% MAD	3.2 KiB	0.1% MAD	+0.0%
Two independent idle machines heap per unit	3.4 KiB	0.1% MAD	3.4 KiB	0.1% MAD	-0.5%
Idle parent with one child heap per unit	5.8 KiB	0.0% MAD	5.8 KiB	0.0% MAD	+0.0%
Parent with observed child registry heap per unit	10.0 KiB	0.0% MAD	10.0 KiB	0.0% MAD	-0.0%
Parent with observed invoked child snapshots heap per unit	6.3 KiB	0.0% MAD	6.3 KiB	0.0% MAD	+0.0%

Process runtime reference change from base

Metric	Base	Base variability	PR	PR variability	Difference
Start and stop a raw generic process	26,791 processes/s	0.6% MAD	26,325 processes/s	1.4% MAD	-1.7%
Start and stop a raw compiled process	67,011 processes/s	0.1% MAD	65,950 processes/s	0.6% MAD	-1.6%

Regression guard

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

Versions and interpretation

• Effect Machine: 0.19.1

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.