chore: switch input schemas to zod mini

[jong-kyung]

Summary

• Switch run-install input validation schemas to zod/mini.
• Update optional field definitions and Zod error detection for the zod/mini API.
• Rebuild the bundled action output in dist/index.mjs.
• Reduce the bundled action size by 53,886 bytes, from 1,320,074 bytes to 1,266,188 bytes.

[Copilot]

Pull request overview

This PR updates the action’s run-install input validation to use Zod’s smaller zod/mini entrypoint (Zod v4), adjusting optional-field and error handling to the mini API with the goal of reducing the bundled action size.

Changes:

• Switched schema definitions used for run-install inputs from zod to zod/mini.
• Updated optional field declarations to z.optional(...) for compatibility with zod/mini.
• Updated Zod error detection in parseRunInstall for the zod/mini surface area.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
src/types.ts	Moves RunInstallSchema/RunInstallInputSchema to zod/mini and updates optional field definitions.
src/inputs.ts	Uses zod/mini and updates the Zod error class check when parsing run-install.

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