SD-M2d: the checker's tag-wanted names the pull request's branch

The lead's ruling of 13:0x: the builder removes the tag when the branch ends, so it needs the branch.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

seats/mesh-delivery-checker/fixtures/events.json

@@ -21,6 +21,7 @@
       "repository": "novox/mesh-sdk",
       "pull": 170,
       "head": "cccccccccccccccccccccccccccccccccccccccc",
+      "branch": "feat/registry",
       "module": "mesh-sdk",
       "package": "go",
       "tag": "registry-1966"

seats/mesh-delivery-checker/seat.json

@@ -179,6 +179,10 @@
             "type": "string",
             "description": "its head"
           },
+          "branch": {
+            "type": "string",
+            "description": "the pull request's branch: its tag is removed when the branch ends"
+          },
           "module": {
             "type": "string",
             "description": "the group member"
@@ -195,6 +199,7 @@
         "required": [
           "repository",
           "head",
+          "branch",
           "module",
           "package"
         ]