feat: add one-command mobile simulator dev loop

Adds `mobile:sim:dev` / `sim:dev` to build, install, launch, and stream the iOS simulator in one command
Updates mobile docs and serve-sim guidance with the new workflow and correct preview URL behavior
Bumps `serve-sim` to a newer version

.agents/skills/serve-sim/SKILL.md

@@ -19,6 +19,7 @@ Use `serve-sim` to stream and control a booted Apple Simulator from the terminal
   - `bun run mobile:sim:serve`
   - `bun run mobile:sim:list`
   - `bun run mobile:sim:kill`
+  - `bun run mobile:sim:dev` — foreground build + run + stream in one command (`--no-build` to skip the build); intended for the user, agents should prefer the discrete scripts above
 
 ## Workflow
 
@@ -36,7 +37,7 @@ Use `serve-sim` to stream and control a booted Apple Simulator from the terminal
    ```sh
    bun run mobile:sim:serve
    ```
-   Surface the returned `url` to the user. It normally starts at `http://localhost:3200`.
+   Surface the returned `url` to the user. It normally starts at `http://127.0.0.1:3100`; always use the `url` from the JSON output rather than assuming the port.
 
 4. Stop helpers when finished unless the user asks to keep them running:
    ```sh
@@ -52,6 +53,8 @@ Use `serve-sim` to stream and control a booted Apple Simulator from the terminal
 - List streams: `bunx serve-sim --list -q`
 - Accessibility tree: `curl http://localhost:3100/ax`
 
+Run direct CLI commands from `packages/mobile` (the binary lives in that package; plain `serve-sim` inside `with-mobile-env.mjs` from elsewhere fails with command not found).
+
 Coordinates are normalized `0..1`, not pixels. Prefer `tap` for simple taps; do not emulate taps using separate `gesture` begin/end commands because that can register as long press.
 
 ## Preconditions