fix(server): address OpenCode recovery review findings (#904)

* fix(server): pin OpenCode SDK version

* fix(server): tolerate transient OpenCode recovery poll errors

* fix(server): address OpenCode recovery findings 2 and 4

* fix(server): address OpenCode recovery finding 1

* fix(server): address OpenCode recovery finding 3

package-lock.json

@@ -39157,7 +39157,7 @@
         "@mariozechner/pi-ai": "^0.70.2",
         "@mariozechner/pi-coding-agent": "^0.70.2",
         "@modelcontextprotocol/sdk": "^1.20.1",
-        "@opencode-ai/sdk": "^1.14.46",
+        "@opencode-ai/sdk": "1.14.46",
         "@sctg/sentencepiece-js": "^1.1.0",
         "@xterm/headless": "^6.0.0",
         "ai": "5.0.78",