✨ feat: add shell completion support

[vaayne]

Summary

• enable urfave/cli shell completion and expose a visible tap completion <shell> command
• add local registry-backed completion for tap site, tap site run, and tap site info
• document bash/zsh/fish/pwsh installation and add completion tests

Testing

• mise run lint
• mise run test

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tap	9be5749	Commit Preview URL Branch Preview URL	Apr 13 2026, 06:49 AM

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Load override scripts when cache directory is absent

When --local-only is not set, a missing cache directory causes script.NewRegistryWithOverride(...) to return os.ErrNotExist, and this branch immediately returns emptyRegistry(). That drops completions from ~/.config/tap/sites even if local override scripts exist (e.g., fresh install before first sync, or cache deleted), so tap site <TAB> shows no local scripts. The fallback should still scan the override directory instead of returning an empty registry.

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