refactor: remove mac attach-only setting

docs/platforms/mac/child-process.md

@@ -1,5 +1,5 @@
 ---
-summary: "Gateway lifecycle on macOS (launchd + attach-only)"
+summary: "Gateway lifecycle on macOS (launchd)"
 read_when:
   - Integrating the mac app with the gateway lifecycle
 ---
@@ -10,8 +10,7 @@ uses the external `clawdbot` CLI (no embedded runtime). This gives you reliable
 auto‑start at login and restart on crashes.
 
 Child‑process mode (Gateway spawned directly by the app) is **not in use** today.
-If you need tighter coupling to the UI, use **Attach‑only** and run the Gateway
-manually in a terminal.
+If you need tighter coupling to the UI, run the Gateway manually in a terminal.
 
 ## Default behavior (launchd)
 
@@ -30,35 +29,18 @@ launchctl bootout gui/$UID/com.clawdbot.gateway
 
 Replace the label with `com.clawdbot.<profile>` when running a named profile.
 
-## Attach‑only (developer mode)
-
-Attach‑only tells the app to **connect to an existing Gateway** without spawning
-one. This is ideal for local dev (hot‑reload, custom flags).
-
-Steps:
-
-1) Start the Gateway yourself:
-   ```bash
-   pnpm gateway:watch
-   ```
-2) In the macOS app: Debug Settings → Gateway → **Attach only**.
-
-The UI should show “Using existing gateway …” once connected.
-
 ## Unsigned dev builds
 
 `scripts/restart-mac.sh --no-sign` is for fast local builds when you don’t have
 signing keys. To prevent launchd from pointing at an unsigned relay binary, it:
 
 - Writes `~/.clawdbot/disable-launchagent`.
-- Sets `clawdbot.gateway.attachExistingOnly=true` in the macOS app defaults.
 
-Signed runs of `scripts/restart-mac.sh` clear these overrides if the marker is
+Signed runs of `scripts/restart-mac.sh` clear this override if the marker is
 present. To reset manually:
 
 ```bash
 rm ~/.clawdbot/disable-launchagent
-defaults write com.clawdbot.mac clawdbot.gateway.attachExistingOnly -bool NO
 ```
 
 ## Remote mode