Shell completions for bash/zsh/fish

[aakashrajput]

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Why

No tab-completion for klaatai/klaatcode commands and flags in bash/zsh/fish. Small quality-of-life win every terminal user feels immediately.

What

• Completion scripts for bash, zsh, and fish covering: top-level commands (chat, run, login, logout, whoami, upgrade, serve, web), their flags, and both binary names
• A klaatai completions <shell> command that prints the script (the standard pattern), so users can do e.g. klaatai completions zsh > ~/.zfunc/_klaatai
• Install hint in the README

Static completions are fine for v1 — no need for dynamic session-id completion.

Where to start

• src/main.tsx — commander already knows the command tree; generate from it if easy, otherwise hand-write the three scripts under a new completions/ dir and have the command print them

Acceptance criteria

• Works in a fresh bash, zsh, and fish shell (document how you tested)
• typecheck green

[Ayush7614]

Hi @aakashrajput — I created a PR for this: #46

Adds klaatai completions <bash|zsh|fish> with static completions for both klaatai and klaatcode.