fix(cmd): hide usage help when command errors occur

[bmahabirbu]

Summary

• Set SilenceUsage: true on the root command so Cobra never prints usage/help text alongside error messages
• Removed redundant per-command SilenceUsage lines that were only active in JSON mode
• Kept SilenceErrors in JSON mode to suppress the Error: prefix for clean JSON output

Before:

$ kortex-cli start aze
Error: workspace not found: aze
Use 'workspace list' to see available workspaces
Usage:
  kortex-cli start ID [flags]

Examples:
# Start workspace by ID
kortex-cli start abc123
...

After:

$ kortex-cli start aze
Error: workspace not found: aze
Use 'workspace list' to see available workspaces

Closes #102

Test plan

• All existing tests pass (make test)
• Verified error output no longer includes help text
• Verify --help flag still shows usage as expected

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between da77bab and 21ab24d.

📒 Files selected for processing (6)

• pkg/cmd/init.go
• pkg/cmd/root.go
• pkg/cmd/workspace_list.go
• pkg/cmd/workspace_remove.go
• pkg/cmd/workspace_start.go
• pkg/cmd/workspace_stop.go

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[feloy]

a little change in the comments, otherwise LGTM. Thanks

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[feloy]

It's not really the prefix being hidden, but the complete error message: cobra by default write the error returned by the command to stderr. In JSON, we don't to pollute the stream, because we are writing the error in the json

[bmahabirbu]

That makes sense thanks!!