chore(check): enforce formatting and clippy gates

[samzong]

Summary

• Add Prettier format validation and Rust Clippy warnings to the full parity gate.
• Keep make fmt aligned by formatting scripts/check.mjs with the TypeScript tooling.
• Simplify the Rust workflow scope helper to satisfy Clippy without changing installer behavior.

Scope Check

• Stays within the v0.1 bundled-skill installer boundary.
• Does not add marketplace, registry, remote install, script execution, GUI, MCP server, or agent runtime behavior.
• No golden case update required; this changes quality gates only, not observable installer behavior.
• No host spec changes; generated host constants are unchanged.

Verification

• make check
• Clean temporary copy: node scripts/check.mjs
• Pre-ship committed scan: no MUST-FIX findings

[chatgpt-codex-connector]

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