fix: include service name in help usage

[zerone0x]

Summary

Fixes #839

Ensure generated service help renders the full invocation path (for example, gws sheets spreadsheets) instead of dropping the service name after argv is filtered for Clap.

Changes

• Set the service-specific Clap command tree bin_name to gws <service> before parsing filtered arguments.
• Keeps command parsing unchanged while correcting help/usage output for nested resources.

Test Plan

• cargo fmt -- --check
• cargo test -q (blocked in this environment: linker cc is not installed, so Rust build scripts for dependencies fail before tests compile)

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the CLI user experience by fixing an issue where the service name was dropped from help/usage output when using nested commands. Additionally, it updates the documentation for several Google Workspace services to include newly supported methods and provide clearer instructions for existing API interactions.

Highlights

• Help/Usage Output Fix: Updated the Clap command tree configuration to explicitly set the bin_name to include the service name, ensuring that help text correctly displays the full invocation path (e.g., gws sheets spreadsheets).
• Documentation Updates: Updated various SKILL.md files across multiple services (Calendar, Chat, Classroom, Drive, Events, Gmail, Meet) to reflect new methods, clarify existing functionality, and improve usage guidance.

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[gemini-code-assist]

Code Review

This pull request updates the CLI command tree building in src/main.rs by dynamically setting the binary name (bin_name) using the first argument. This ensures that nested help and usage text rendered by Clap correctly displays the full binary invocation (e.g., gws sheets spreadsheets --help instead of starting at gws spreadsheets). There are no review comments, and I have no additional feedback to provide.

[zerone0x]

Superseded by #866, which is rebased onto upstream main to avoid the fork branch conflict.