feat: add Zsh shell completion support

[jelloeater-agent]

Add Zsh shell completion for all hcom commands via a new hcom completion zsh command.

Changes

New: hcom completion zsh command

• Generates a complete _hcom Zsh completion function covering:
  • All 18 CLI commands (send, list, events, stop, start, listen, status, config, hooks, archive, reset, transcript, bundle, kill, term, relay, run, update, completion)
  • All 11 released tools + aliases (claude, gemini, codex, opencode, kilo/kilocode, pi/pi-agent, omp/omp-agent, antigravity/agy, cursor/cursor-agent, kimi, copilot)
  • All hook command names (70+)
  • Resume/fork commands (r/resume, f/fork)
  • Global flags (--name, --go, --help, -h, --version, -v, --new-terminal)
  • Numeric count prefix (hcom 3 claude ...)
  • Per-tool args flags (e.g. --claude-args, --gemini-args)
  • All per-command flags with descriptions

--install flag

• Writes the completion script to a writable directory in $fpath or standard locations (~/.zsh/completion, /usr/local/share/zsh/site-functions/, ~/.oh-my-zsh/completions/)

Generation from integration specs

• The completion script is built programmatically from integration_spec::ALL, ensuring it stays in sync as tools are added or removed
• All 1993 tests pass

Usage

# Source directly
eval "$(hcom completion zsh)"

# Install permanently
hcom completion zsh --install