convert grammar to submodule and remove target artifacts

The zed-ext/grammars/gotmpl directory was accidentally added as an embedded git repo rather than a proper submodule. Converted it to a submodule pointing to ngalaiko/tree-sitter-go-template at the commit specified in extension.toml.

Also removed the zed-ext/target/ build directory from git tracking - these Rust build artifacts should never have been committed.

Author: Jason-Abbott

.beans/.sync.json

@@ -12,6 +12,12 @@
         "task_id": "868h4jx7w",
         "synced_at": "2026-01-18T18:31:41.496634Z"
       }
+    },
+    "gozer-miqk": {
+      "clickup": {
+        "task_id": "868h4jxeg",
+        "synced_at": "2026-01-18T18:35:18.553764Z"
+      }
     }
   }
 }

.beans/gozer-miqk--clean-up-zed-ext-git-artifacts.md

@@ -0,0 +1,3 @@
+[submodule "zed-ext/grammars/gotmpl"]
+	path = zed-ext/grammars/gotmpl
+	url = https://github.com/ngalaiko/tree-sitter-go-template