Shorten top-level help output#6
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…unts Top-level help no longer shows descriptions for each command, keeping the output concise. Commands and namespaces with children now display a "(N sub-commands)" indicator so users know to drill deeper.
Uses golang.org/x/term to detect if stdout is a terminal and applies faint ANSI styling to "(N sub-commands)" hints. Respects NO_COLOR. The IsTerminal check is cached with sync.OnceValue.
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Summary
Test plan
TestDispatcherHelpverifies top-level help omits descriptionsTestDispatcherSubCommandHelpverifies sub-command count appears for namespacesTestDispatcherNamespaceDiscoveryverifies namespace count at top level