fix: log auth errors to stderr instead of silently discarding

[Bortlesboat]

Summary

When OAuth authentication fails in the main CLI flow, the error was silently discarded and the request proceeded unauthenticated. Users then received confusing 401/403 API errors with no indication of the root cause (expired token, missing credentials, wrong account, etc.).

Now prints the original error message and a hint to stderr.

Changes

• src/main.rs: Replace Err(_) => (None, AuthMethod::None) with logging the error and a hint to run gws auth login

Note: The MCP server (mcp_server.rs:430-435) already logs auth failures correctly — this brings the main CLI in line with that pattern.

Test plan

• CI: cargo test, cargo clippy, cargo fmt
• Manual: run any API command without auth configured, verify error + hint appear on stderr

[changeset-bot]

🦋 Changeset detected

Latest commit: 8408910

The changes in this PR will be included in the next version bump.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[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 significantly enhances the user experience of the CLI by addressing a critical issue where OAuth authentication failures were previously suppressed. By explicitly logging these errors to stderr and providing actionable advice, users will now immediately understand why their commands are failing, thereby reducing frustration and debugging time.

Highlights

• Improved Authentication Error Handling: Authentication failures in the main CLI flow are now logged to stderr with a helpful hint, preventing silent discarding of errors and confusing API responses.

Changelog

• .changeset/fix-auth-error-logging.md
  • Added a new changeset file to document the fix for authentication error logging.
• src/main.rs
  • Modified the main application logic to log authentication errors and provide a hint to stderr.
  • Replaced silent error discarding with explicit error reporting for OAuth authentication failures.

Activity

• No specific activity (comments, reviews, or progress updates) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request modifies the main CLI flow to log authentication failures to stderr instead of silently discarding them. The change includes printing the error and a hint for the user. My feedback includes a suggestion to make the hint more comprehensive.

[gemini-code-assist]

The hint about authentication methods is helpful, but it's incomplete. It omits the GOOGLE_WORKSPACE_CLI_CREDENTIALS_FILE environment variable, which is another primary way to provide credentials. To provide a more comprehensive hint to the user, it would be better to include it.

Suggested change

	eprintln!("hint: run `gws auth login` to authenticate, or set GOOGLE_WORKSPACE_CLI_TOKEN");
	eprintln!("hint: run `gws auth login` to authenticate, or set GOOGLE_WORKSPACE_CLI_TOKEN or GOOGLE_WORKSPACE_CLI_CREDENTIALS_FILE");