fix: opencode compat tool call rendering and default to no-token

- Fix tool name lost on ToolResult events (persist via tool_name_by_call)
- Fix tool input lost on ToolResult events (persist via tool_args_by_call)
- Fix tool output in wrong field (error -> output)
- Fix text doubling in streaming (defer emit to ItemCompleted)
- Fix missing delta field in text streaming events
- Default server mode to no-token when --token not specified
- Add install-fast-sa and install-fast-gigacode justfile targets

research/opencode-compat/snapshots/native/session-details.json

@@ -0,0 +1,17 @@
+{
+  "id": "ses_3ce42bdb9ffeEIUUu08AuKTJms",
+  "slug": "witty-eagle",
+  "version": "1.1.49",
+  "projectID": "c4153c5335dc81f0e622888f1f387c4b84dc54d5",
+  "directory": "/home/nathan/sandbox-agent/research/opencode-compat",
+  "title": "Hello from OpenCode",
+  "time": {
+    "created": 1770361012806,
+    "updated": 1770361017462
+  },
+  "summary": {
+    "additions": 0,
+    "deletions": 0,
+    "files": 0
+  }
+}