[code-infra] Add ts-package-migration skill#48545
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Adds a reusable Claude Code skill (
.claude/skills/ts-package-migration/) that encodes the playbook for migrating a MUI package from hand-written.js+.d.tsto true TypeScript (single.ts/.tsxsource,tsc-emitted declarations), like@mui/utils.Captures the procedure and the non-obvious findings discovered during the
@mui/styled-engineconversion (#48544): thecode-infra builddeclaration pipeline andtsconfig.build.jsonrequirement, Babel's import-elision behavior (import type * as/export type *), the(X as any).propTypes /* remove-proptypes */trick to suppress the tsc expando while keeping the production guard,stripInternalfor runtime-only exports, themui-env.d.tsconvention forprocess.env(nonodein build types), the'use client'+export *ESLint constraint, the quality-gate commands, and a bidirectional type-equivalence probe to prove the exported type surface is preserved.Tooling/docs only — no runtime or package changes.