[Aschenbath]

Add corepack --dir <path> <command> ... to run Corepack utility commands and package managers from another directory. Support relative/absolute paths and --dir=path, load the target project's configuration, and forward arguments after the package manager name to that manager.

Use a Clipanion proxy command to change the working directory before dispatch, report invalid directories as usage errors, and keep leading options in the Corepack CLI parser so paths containing @ work. Document the syntax and add 12 CLI regressions, including a real pnpm subprocess that verifies both its working directory and forwarding of pnpm's own --dir option.

Validation on Node.js 24.20.0:

• Build: passed.
• Full Vitest suite with NOCK_ENV=replay: 9 files passed; 183 tests passed and 1 existing expected failure.
• tsc --noEmit: passed.
• ESLint with --max-warnings=0: passed.

Local test setup isolates inherited proxy settings from CLI fixtures while retaining access for the live npm-key check. Compilation caches were disabled to accommodate the small temporary filesystem. No tests were skipped or modified for these environment adjustments.

Closes #677

[aduh95]

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