feat: add kiqr completion command (bash/zsh/fish)

[kjellbergzoey]

What

Adds a new kiqr completion <bash|zsh|fish> command that prints an idiomatic shell completion script to stdout. Sourcing it gives tab-completion for kiqr's top-level subcommands (up, down, restart, init, info, open, logs, wp, watch, destroy, doctor, db).

Why (the DX win)

Typing kiqr <TAB> and getting the available commands is a meaningful quality-of-life improvement, especially while learning the CLI. The completion script is fully static and deterministic, so the shell can source it on startup without invoking the CLI.

Install

# bash
kiqr completion bash >> ~/.bashrc

# zsh (drop into an fpath dir)
kiqr completion zsh > "${fpath[1]}/_kiqr"

# fish
kiqr completion fish > ~/.config/fish/completions/kiqr.fish

Design

• src/lib/completion.ts — pure, unit-tested generation. Exports COMPLETION_SHELLS, CompletionShell, KIQR_COMMANDS, isCompletionShell, and generateCompletion(shell, commands). Each shell gets its idiomatic markers (complete -F for bash, #compdef/compdef for zsh, complete -c ... __fish_use_subcommand for fish).
• src/commands/completion.tsx — thin Pastel command. The shell positional arg is a zod enum over COMPLETION_SHELLS, so unsupported shells produce a clear validation error with the allowed choices.
• tests/lib/completion.test.ts — asserts each shell returns a non-empty script containing every command name plus the right shell-specific markers, custom command lists are honored, and unknown shells are rejected.

No new files touch shared modules (index.tsx/README.md); Pastel auto-discovers the command.

Verification

• npm run typecheck, npm test (126 passing), npm run build, npm run lint all green.
• Smoke-tested the built CLI for all three shells plus an invalid shell (clean error, exit 1).

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