Add guide: SSH from iPhone 17 over Tailscale (app vs browser)

[PorcoNoir]

What

Adds docs/iphone-17-ssh-via-tailscale.md — step-by-step instructions for giving an iPhone 17 SSH capabilities over Tailscale.

Decision: app vs. browser

The task asked to decide between "an app" and "a browser from Tailscale." The guide makes a clear recommendation and documents both:

• Recommended — dedicated SSH client app (+ Tailscale app): Blink Shell (native Mosh, survives Wi‑Fi⇄cellular) or Termius (polished, multi-host vault). Real terminal, keys, snippets, resilient long sessions. Works with plain SSH or keyless Tailscale SSH.
• Browser — Tailscale web SSH console in Safari: zero phone setup, great for occasional quick logins, but requires Tailscale SSH on the target and is a basic terminal that drops on tab close/network change.

A comparison table, full setup steps for each path, an appendix on enabling Tailscale SSH (tailscale up --ssh + ACL example), troubleshooting, and cited sources are included.

Note: "create an app" is interpreted as use an existing SSH client app, not build a custom one — building a bespoke app would be unnecessary effort given mature native clients already exist. This interpretation is stated in the doc.

This is a documentation-only change; it does not touch the elmclient code.

https://claude.ai/code/session_01UUyLLLkKdXDsNs1yRySdMf

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