Add fish, PowerShell, and Nushell completion support

[integrii]

Summary

• add fish, PowerShell, and Nushell completion generators that traverse parser state to emit shell-specific scripts
• document the expanded completion support in the README
• expand completion tests to validate outputs for bash, zsh, fish, PowerShell, and Nushell across shared sample commands

Testing

• go test ./...
• go vet ./...

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https://chatgpt.com/codex/tasks/task_e_68e0a4f789748323892f10f75ffc6511

[chatgpt-codex-connector]

💡 Codex Review

flaggy/parser.go

Lines 141 to 150 in 6b9a8a1

	// Completion takes in a shell type and outputs the completion script for
	// that shell.
	func (p *Parser) Completion(completionType string) {
	switch {
	case strings.ToLower(completionType) == "bash":
	fmt.Print(GenerateBashCompletion(p))
	case strings.ToLower(completionType) == "zsh":
	fmt.Print(GenerateZshCompletion(p))
	default:
	fmt.Fprintf(os.Stderr, "Unsupported shell specified for completion: %s\n", completionType)

Extend Parser.Completion to route new shells

The commit advertises fish, PowerShell, and Nushell completions and README examples now call ./app completion fish etc., but Parser.Completion still only handles bash and zsh and prints an "Unsupported shell" error for all other values. As a result the public API and CLI entry point cannot emit the new scripts even though the generators exist, so the documented commands will fail. Consider adding branches for the new shells in this switch.

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[integrii]

@codex address the problem of 'unsupported shell' being returned for the new shell completion types by the subcommand parser. Add a test that directly tests the triggering of each autocomplete call and verifies the output.

[chatgpt-codex-connector]

Summary

• Extended the completion dispatcher to recognize fish, PowerShell, and Nushell while centralizing supported shell messaging for CLI validation. parser.goL13-L116 parser.goL146-L161
• Updated help output to advertise every completion shell and aligned the minimal help test with the new description. helpValues.goL107-L118 helpValues_blackbox_test.goL37-L55
• Added a parser-level completion test that captures stdout/stderr to confirm each shell script is emitted as expected. parser_completion_test.goL13-L92

Testing

• ✅ go test ./...
• ✅ go vet ./...
• ⚠️ goimports -w parser.go parser_completion_test.go (not available in container)

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