Add runtime performance benchmarks

[SandroMaglione]

Summary

• add repeatable local runtime benchmarks for planning, event drainage, lifecycle, and idle memory
• compare the compiled library with pinned XState 5 and XState 6 alpha baselines
• produce human-readable output and versioned JSON reports for future automation
• run base and pull request benchmarks three times on the same GitHub-hosted runner
• publish the median results through a read-only benchmark workflow and a separate trusted sticky-comment workflow

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
• pnpm perf:types
• Relevant example checks, when examples changed — not applicable
• Reviewed the automated type-performance report, when the public TypeScript API or inference changed — no public API change
• Reviewed the automated runtime-performance report, when runtime behavior changed — bootstrap job and artifact passed; sticky comments activate after the trusted workflow lands on main

[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.defineStates (3 states)	2,965	2,965	0 (0.0%)
Machine.make (3 states, 2 events)	8,731	8,731	0 (0.0%)
machine.handle (3 states, 2 transitions)	23,634	23,634	0 (0.0%)
machine.handle (depth 8)	113,023	113,023	0 (0.0%)
machine.handle (depth 12)	125,661	125,661	0 (0.0%)
machine.handle (depth 16)	141,003	141,003	0 (0.0%)
machine.handle (depth 24)	179,799	179,799	0 (0.0%)
machine.handle (wide depth 16)	210,137	210,137	0 (0.0%)
machine.handle (parallel/history/choice)	128,876	128,876	0 (0.0%)
machine.handle (4 successive calls)	129,498	129,498	0 (0.0%)
machine exact input/output/error/services	107,371	107,371	0 (0.0%)
execution adapter readiness	122,890	122,890	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.defineStates (3 states)	2,910	2,910	0 (0.0%)
Machine.make (3 states, 2 events)	5,758	5,758	0 (0.0%)
machine.handle (3 states, 2 transitions)	14,903	14,903	0 (0.0%)
machine.handle (depth 8)	105,546	105,546	0 (0.0%)
machine.handle (depth 12)	116,984	116,984	0 (0.0%)
machine.handle (depth 16)	131,126	131,126	0 (0.0%)
machine.handle (depth 24)	167,522	167,522	0 (0.0%)
machine.handle (wide depth 16)	198,169	198,169	0 (0.0%)
machine.handle (parallel/history/choice)	110,514	110,514	0 (0.0%)
machine.handle (4 successive calls)	114,497	114,497	0 (0.0%)
machine exact input/output/error/services	95,819	95,819	0 (0.0%)
execution adapter readiness	96,968	96,968	0 (0.0%)

Check times (informational)

Scenario	Base	PR
Effect only	0.02s	0.02s
Import effect-machine	0.02s	0.02s
Machine.defineStates (3 states)	0.08s	0.07s
Machine.make (3 states, 2 events)	0.12s	0.11s
machine.handle (3 states, 2 transitions)	0.18s	0.16s
machine.handle (depth 8)	0.38s	0.38s
machine.handle (depth 12)	0.42s	0.41s
machine.handle (depth 16)	0.45s	0.45s
machine.handle (depth 24)	0.51s	0.53s
machine.handle (wide depth 16)	0.56s	0.57s
machine.handle (parallel/history/choice)	0.46s	0.47s
machine.handle (4 successive calls)	0.44s	0.45s
machine exact input/output/error/services	0.39s	0.40s
execution adapter readiness	0.42s	0.42s

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