feat: delegate project register; registrar-only ID minting

STATE-WP-0080-T02: statehub register routes project-flavor scaffolding
through rmgr scaffold and keeps only repo + host-path registration.
T01 refuse remains when GOAL.md is missing and --wp-prefix is not set.

RMGR-WP-0005-T01: C-06/C-11/C-32 skip mint+writeback unless this
instance is the identifier registrar (STATEHUB_REGISTRAR or railiance
hostname).

tests/test_consistency_check.py

@@ -1299,6 +1299,7 @@ class TestC06WorkstreamCreation:
         monkeypatch.setattr("consistency_check._detect_ahead_of_remote", lambda _repo_path: 0)
         monkeypatch.setattr("consistency_check._write_custodian_brief", lambda *args, **kwargs: False)
         monkeypatch.setattr("consistency_check._git_push", lambda _repo_path: (True, "pushed"))
+        monkeypatch.setenv("STATEHUB_REGISTRAR", "1")
 
         report = fix_repo("http://unused", "demo-repo")
 
@@ -1309,6 +1310,69 @@ class TestC06WorkstreamCreation:
         assert 'state_hub_task_id: "new-task"' in patched
         assert any("C-06 fixed" in fix for fix in report.fixes_applied)
 
+    def test_fix_repo_skips_c06_mint_when_not_registrar(self, tmp_path, monkeypatch):
+        repo = tmp_path / "repo"
+        workplans = repo / "workplans"
+        workplans.mkdir(parents=True)
+        wp = workplans / "STATE-WP-0001-demo.md"
+        wp.write_text(
+            "---\n"
+            "id: STATE-WP-0001\n"
+            "type: workplan\n"
+            "title: Demo Workplan\n"
+            "domain: financials\n"
+            "repo: demo-repo\n"
+            "status: ready\n"
+            "owner: codex\n"
+            "---\n\n"
+            "## Implement Demo\n\n"
+            "```task\n"
+            "id: STATE-WP-0001-T01\n"
+            "status: todo\n"
+            "priority: high\n"
+            "```\n",
+            encoding="utf-8",
+        )
+
+        created = []
+
+        def fake_get(_api_base, path, params=None, **_kwargs):
+            if path == "/repos/demo-repo":
+                import socket
+
+                return {
+                    "id": "repo-1",
+                    "slug": "demo-repo",
+                    "local_path": str(repo),
+                    "host_paths": {socket.gethostname(): str(repo)},
+                    "domain_slug": "financials",
+                }
+            if path == "/topics":
+                return [{"id": "topic-1", "domain_slug": "financials"}]
+            return []
+
+        def fake_post(_api_base, path, body):
+            created.append((path, body))
+            return {"id": "should-not-mint", **body}
+
+        monkeypatch.setattr("consistency_check._api_get", fake_get)
+        monkeypatch.setattr("consistency_check._api_post", fake_post)
+        monkeypatch.setattr("consistency_check._api_patch", lambda *args, **kwargs: {"ok": True})
+        monkeypatch.setattr("consistency_check._detect_behind_remote", lambda _repo_path: False)
+        monkeypatch.setattr("consistency_check._detect_ahead_of_remote", lambda _repo_path: 0)
+        monkeypatch.setattr("consistency_check._write_custodian_brief", lambda *args, **kwargs: False)
+        monkeypatch.setattr("consistency_check._git_push", lambda _repo_path: (True, "pushed"))
+        monkeypatch.setenv("STATEHUB_REGISTRAR", "0")
+
+        report = fix_repo("http://unused", "demo-repo")
+
+        assert created == []
+        patched = wp.read_text(encoding="utf-8")
+        assert "state_hub_workstream_id" not in patched
+        assert "state_hub_task_id" not in patched
+        assert any("not the identifier registrar" in fix for fix in report.fixes_applied)
+        assert any(issue.check_id == "C-06" for issue in report.issues)
+
 # ---------------------------------------------------------------------------
 # _git_pull (T02 remote fix helper)
 # ---------------------------------------------------------------------------