perf: optimize Rslib startup build#803
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Summary
Upgrade Rslib-related tooling and tighten the CLI startup fast paths without changing the published command contract.
The accepted path keeps JS/package size effectively flat while improving cheap startup medians:
--versionfrom 34.2 ms to 31.0 ms and--helpfrom 43.8 ms to 37.8 ms in the local 50-run size report. Rejected bundle-split/minify prototypes either grew the package or broke the CLI.Validation
Verified with formatter, Oxc lint, TypeScript, MCP metadata check, Rslib build, CLI smoke tests, package export tests, and the size report comparison.
pnpm check:toolinghung locally before output, so its direct component commands were run and passed individually.