docs: document runtime global and deploy flags

[tasodoufu]

Summary

Document the global hflow flags and the deploy options that were recently added to the CLI reference.

Why

Resolves #72. Users can now find --version, -v/--verbose, deploy --output-dir, and deploy --requirements in docs/RUNTIME.md, with wording aligned to the current CLI help and behavior.

User impact

The runtime reference is more complete and no product behavior changes.

Validation

• uv run python - <<'PY' ... (asserted all four option names are documented)
• git diff --check
• Markdown link check not run: lychee is not installed in the environment.

Unverified

The full lychee command from CONTRIBUTING.md was not run because the tool is unavailable locally.

[github-actions]

👋 Hi @tasodoufu — thank you so much for your first contribution to HFlow!

A maintainer will review your pull request as soon as possible. In the meantime:

• ⭐ Star the repo: https://github.com/Hebbian-Robotics/hflow
• 💬 Join our Discord: https://discord.gg/vacepQvjmg
• 📖 Check CONTRIBUTING.md for the validation commands CI will run
• 📣 Share the project with your network

💡 Tip: one open pull request per contributor at a time. Issues with an assignee are taken; everything else is fair game.

We are excited to have you here and appreciate your help making the project better! 🙌

[kstonekuan]

Thank you @tasodoufu, and welcome! Clean first contribution: the wording matches the actual --help text, the placement is sensible, and the --requirements cross-reference to hflow up is exactly right.

What I validated locally:

• Ran the full lychee link check from CONTRIBUTING.md on your branch (you noted it was unavailable in your environment): 230 links, 0 errors.
• Verified the "must appear before the subcommand" claim against the real CLI: hflow -v status parses, hflow status -v exits 2. Nice catch documenting that; it is exactly the kind of detail argparse makes non-obvious.
• Checked both deploy flag descriptions against src/hflow/cli.py; both match.

Merging now. If you would like another one, the open good first issues have plenty left (issues with an assignee are taken; everything else is fair game), and we hang out on Discord.