Move broker PTY logic into fork-terminal

Author: pRizz

docs/upstream-sync/fork-feature-audit.md

@@ -105,7 +105,9 @@ Purpose: track **all** fork deltas and keep them preserved during upstream merge
 
 ### D1. Broker-backed PTY
 - Files:
-  - `packages/opencode/src/pty/**`
+  - `packages/opencode/src/pty/index.ts`
+  - `packages/opencode/src/pty/broker-pty.ts` (wrapper)
+  - `packages/fork-terminal/src/broker-pty.ts`
   - `packages/opencode/src/server/routes/pty.ts`
   - `packages/fork-terminal/src/server.ts`
 - Behavior:

packages/fork-terminal/package.json

@@ -11,12 +11,14 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
+    "@opencode-ai/fork-auth": "workspace:*",
     "@opencode-ai/ui": "workspace:*",
     "@thisbeyond/solid-dnd": "0.7.5",
     "ghostty-web": "0.3.0",
     "solid-js": "catalog:"
   },
   "devDependencies": {
+    "hono": "catalog:",
     "typescript": "catalog:",
     "@types/bun": "catalog:"
   }