chore: migrate to Rstack CLI

[chenjiahan]

Summary

Migrates the toolchain to Rstack CLI — the unified rstack package and rs commands. Four standalone configs collapse into one rstack.config.ts, and five dev dependencies collapse into one.

Follows the same approach already used in rsbuild-plugin-type-check, with scripts matching rsbuild-plugin-template.

Changes

• Config consolidated into rstack.config.ts via define.lib / define.test / define.fmt / define.staged / define.lint, replacing rslib.config.ts, rslint.config.ts, rstest.config.ts, .prettierrc and .prettierignore. Existing behavior is preserved, including output.target: 'node' and the globals.browser / globals.rstest lint overrides (now provided by the define.lint factory, so the globals import is gone).
• Dependencies: @rslib/core, @rslint/core, @rstest/core, prettier and simple-git-hooks replaced by a single rstack dev dependency. They remain available as transitive rstack dependencies.
• Scripts: rs lib, rs lib -w, rs test, rs lint, rs fmt, plus a new check script (rs check = rs lint && rs fmt --check).
• Git hooks: simple-git-hooks replaced by rs hooks, with rs staged in .rstack/hooks/pre-commit. The corresponding pnpm allowBuilds entry is dropped.
• Playground: ported to define.app in playground/rstack.config.ts, with rs build / rs dev scripts.
• VS Code: recommends the unified rstack.rstack extension instead of rstack.rslint + esbenp.prettier-vscode.

Verification

Check	Result
pnpm build (rs lib)	esm + cjs + dts built
pnpm run check	Lint 0 errors, formatting clean
pnpm run test (rs test)	4/4 passing
pnpm dev (rs lib -w)	watch rebuild works
playground rs build / rs dev	HTTPS 200, self-signed cert served
pre-commit hook	rs staged ran lint + fmt, exit 0
pnpm install --frozen-lockfile	passes, no peer warnings

Build output is byte-identical to before the migration — dist/index.js, dist/index.cjs, dist/index.d.ts and dist/util.d.ts all match the pre-migration baseline exactly, so published consumers see no change. Lint and tests hold their pre-migration baseline (0 errors, 4/4).

Notes for reviewers

• package.json field order changed slightly (repository now after bugs) because define.fmt enables sortPackageJson. Cosmetic only.
• Playground imports ../dist/index.js rather than ../src. Rstack loads configs as native ESM, which cannot resolve this package's TypeScript ./util.js import convention from source. Switching source to ./util.ts fixed loading but broke declaration generation, and would have required loosening the published tsconfig.json, so the playground uses the built output instead — which also exercises the real published entry point. src/ is unchanged.
• prepare may warn Git hooks setup skipped for anyone with an existing core.hooksPath (e.g. a global hook manager). Hooks still run through that path; making Rstack the owner needs a one-time rs hooks --force, intentionally not done here.
• .agents/skills/rstack-cli-docs/ is added as a version-matched docs Skill for coding agents, mirroring rsbuild-plugin-type-check.

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