diff --git a/api/services/forge_repository.py b/api/services/forge_repository.py
index 1565cdb..25cb788 100644
--- a/api/services/forge_repository.py
+++ b/api/services/forge_repository.py
@@ -83,6 +83,10 @@ class ForgeRepositoryGateway(Protocol):
         self, *, instance: str, owner: str, old_name: str, new_name: str
     ) -> ForgeRepositorySnapshot: ...
 
+    async def descends_from(
+        self, *, instance: str, owner: str, name: str, base: str, head: str
+    ) -> bool: ...
+
 
 def _write_token() -> str | None:
     path = os.environ.get(WRITE_TOKEN_FILE_ENV)
@@ -207,6 +211,34 @@ class ForgejoRepositoryGateway:
             raise ForgeRepositoryUnreadable("Renamed Forge repository is not readable")
         return renamed
 
+    async def descends_from(
+        self, *, instance: str, owner: str, name: str, base: str, head: str
+    ) -> bool:
+        """True when ``base`` is an ancestor of (or equal to) ``head``.
+
+        ``compare/<head>...<base>`` lists commits reachable from ``base`` but not
+        from ``head``; it is empty exactly when ``base`` is contained in ``head``.
+        """
+        if base == head:
+            return True
+        url = f"{self._api(instance, owner, name)}/compare/{quote(head, safe='')}...{quote(base, safe='')}"
+        try:
+            async with httpx.AsyncClient(
+                timeout=settings.repository_rename_forge_timeout_seconds
+            ) as client:
+                response = await client.get(url, headers=self._headers(forge_read_token()))
+                if response.status_code == 404:
+                    return False
+                response.raise_for_status()
+                data = response.json()
+        except (httpx.HTTPError, ValueError) as exc:
+            raise ForgeRepositoryUnreadable(
+                f"Forge ancestry check failed ({type(exc).__name__})"
+            ) from exc
+        commits = data.get("commits")
+        total = data.get("total_commits")
+        return (isinstance(commits, list) and not commits) or total == 0
+
 
 _gateway = ForgejoRepositoryGateway()
 
diff --git a/api/services/repository_rename.py b/api/services/repository_rename.py
index 91d1f15..21c4f56 100644
--- a/api/services/repository_rename.py
+++ b/api/services/repository_rename.py
@@ -47,6 +47,7 @@ from api.services.forge_repository import (
     ForgeRepositoryGateway,
     ForgeRepositoryRedirected,
     ForgeRepositorySnapshot,
+    ForgeRepositoryError,
     ForgeRepositoryUnreadable,
 )
 
@@ -1248,7 +1249,22 @@ async def verify_operation(
     if forge is not None:
         add("forge_coordinate", forge.name == expected_name, expected_name, forge.name)
         add("forge_repository_id", forge.repository_id == operation.expected_forge_repository_id, operation.expected_forge_repository_id, forge.repository_id)
-        add("source_commit", forge.head_commit == _expected_head(operation), _expected_head(operation), forge.head_commit)
+        anchor = _expected_head(operation)
+        head_ok = forge.head_commit == anchor
+        if not head_ok and "source-synced" in (_telemetry(operation)[0].get("phases") or {}):
+            # After source-synced the source repository keeps moving (its own
+            # commits and sync writebacks); the recorded head must stay contained.
+            try:
+                head_ok = await gateway.descends_from(
+                    instance=operation.expected_forge_instance,
+                    owner=operation.expected_forge_owner,
+                    name=expected_name,
+                    base=anchor,
+                    head=forge.head_commit,
+                )
+            except (ForgeRepositoryError, AttributeError):
+                head_ok = False
+        add("source_commit", head_ok, anchor, forge.head_commit)
         add("default_branch", forge.default_branch == operation.expected_default_branch, operation.expected_default_branch, forge.default_branch)
         add("projection_readable", forge.projection_readable and forge.projection_source_present, True, forge.projection_readable and forge.projection_source_present)
     expected_canonical = operation.old_slug if operation.phase in {"preflighted", "forge-renamed", "rolled-back"} else operation.new_slug
@@ -1302,6 +1318,25 @@ async def verify_operation(
             "baseline": int(baseline_record.get("count") or 0),
             "current": int(current_record.get("count") or 0),
         }
+    # Active dispatch is a status-derived view: finishing a task during the
+    # operation retires it from dispatch without losing the record.  Only a
+    # dispatch id whose task/workplan no longer exists counts as missing.
+    retired_dispatch: list[str] = []
+    live_ids = set((current.get("tasks") or {}).get("ids") or []) | set(
+        (current.get("workplans") or {}).get("ids") or []
+    )
+    for bucket in (missing, changed_relationships):
+        ids = bucket.get("active_dispatch")
+        if not ids:
+            continue
+        gone = [item for item in ids if item not in live_ids]
+        retired_dispatch = sorted(set(retired_dispatch) | (set(ids) - set(gone)))
+        if gone:
+            bucket["active_dispatch"] = gone
+        else:
+            del bucket["active_dispatch"]
+    if retired_dispatch:
+        counts.pop("active_dispatch", None)
     # New telemetry may legitimately arrive while a phased operation is being
     # executed.  Continuity means every baseline identity still exists; it does
     # not freeze the repository's append-only history at the preflight count.
@@ -1309,7 +1344,7 @@ async def verify_operation(
         "relationship_continuity",
         not missing and not changed_relationships,
         {"missing": {}, "changed": {}},
-        {"missing": missing, "changed": changed_relationships},
+        {"missing": missing, "changed": changed_relationships, "retired_dispatch": retired_dispatch},
     )
     add(
         "record_counts_non_decreasing",
diff --git a/docs/repository-rename-operations.md b/docs/repository-rename-operations.md
index a997120..90c02bb 100644
--- a/docs/repository-rename-operations.md
+++ b/docs/repository-rename-operations.md
@@ -126,6 +126,12 @@ revision pushed from the fresh clone. `source-synced` therefore requires the clo
 `head_commit` to equal the current Forge head, records the baseline and `head_advanced`,
 and later phases anchor on that recorded head. Drift beyond it still fails closed.
 
+After `source-synced` the source repository keeps moving. `verify` accepts a later Forge head
+only when it contains the recorded `source-synced` head (Forgejo `compare`); unrelated drift
+still fails. Tasks or workplans finished during the operation leave active dispatch and are
+reported as `retired_dispatch` rather than missing; a dispatch id whose record no longer
+exists is still a failure.
+
 The private source evidence file must include the assertions enforced by State
 Hub. Extra non-secret references are allowed:
 
diff --git a/tests/test_repository_rename_api.py b/tests/test_repository_rename_api.py
index 5988bae..6e65460 100644
--- a/tests/test_repository_rename_api.py
+++ b/tests/test_repository_rename_api.py
@@ -38,6 +38,7 @@ class FakeForge:
         self.rename_calls = 0
         self.extra: dict[str, int] = {}
         self.unreadable = False
+        self.contains: dict[str, set[str]] = {}
 
     def snapshot(self, name: str, repository_id: int | None = None) -> ForgeRepositorySnapshot:
         return ForgeRepositorySnapshot(
@@ -65,6 +66,9 @@ class FakeForge:
             return self.snapshot(name, self.extra[name])
         return None
 
+    async def descends_from(self, *, instance: str, owner: str, name: str, base: str, head: str):
+        return base == head or base in self.contains.get(head, set())
+
     async def rename(self, *, instance: str, owner: str, old_name: str, new_name: str):
         assert old_name == self.name
         assert new_name not in self.extra
@@ -769,21 +773,44 @@ async def test_source_sync_may_advance_forge_head_past_the_baseline(client, rena
     assert recorded["head_advanced"] is True
     assert recorded["baseline_commit"] == "a" * 40
 
-    # Later phases anchor on the recorded head, so drift beyond it still fails.
-    verify = await client.get(
-        f"/repos/{repo['id']}/rename/operations/{operation['id']}/verify"
-    )
-    assert verify.status_code == 200, verify.text
-    assert all(
-        check["ok"] for check in verify.json()["checks"] if check["name"] == "source_commit"
-    )
+    # Later commits that contain the recorded head are accepted; unrelated drift is not.
+    verify_url = f"/repos/{repo['id']}/rename/operations/{operation['id']}/verify"
+
+    def source_commit_ok(response):
+        assert response.status_code == 200, response.text
+        return [c["ok"] for c in response.json()["checks"] if c["name"] == "source_commit"][0]
+
+    assert source_commit_ok(await client.get(verify_url)) is True
+    forge.head = "d" * 40
+    forge.contains[forge.head] = {advanced}
+    assert source_commit_ok(await client.get(verify_url)) is True
     forge.head = "c" * 40
-    drifted = await client.get(
-        f"/repos/{repo['id']}/rename/operations/{operation['id']}/verify"
+    assert source_commit_ok(await client.get(verify_url)) is False
+
+
+@pytest.mark.asyncio
+async def test_task_completed_during_operation_is_retired_not_missing(client, rename_setup):
+    repo, _forge = rename_setup
+    workplan = await create_test_workplan(
+        client, repo_id=repo["id"], slug="FLEX-WP-0043", status="active"
     )
-    assert any(
-        not check["ok"] for check in drifted.json()["checks"] if check["name"] == "source_commit"
+    task = await client.post(
+        "/tasks/",
+        json={"workplan_id": workplan["id"], "title": "Finish during rename", "status": "todo", "priority": "high"},
     )
+    assert task.status_code == 201, task.text
+    preflight = await _preflight(client, repo["id"])
+    operation, confirmation = await _operation(client, repo["id"], preflight)
+    await _phase(client, repo["id"], operation["id"], "forge-renamed", "preflighted", confirmation)
+    await _phase(client, repo["id"], operation["id"], "statehub-rebound", "forge-renamed", confirmation)
+    done = await client.patch(f"/tasks/{task.json()['id']}", json={"status": "done"})
+    assert done.status_code == 200, done.text
+    verify = await client.get(f"/repos/{repo['id']}/rename/operations/{operation['id']}/verify")
+    assert verify.status_code == 200, verify.text
+    checks = {c["name"]: c for c in verify.json()["checks"]}
+    assert checks["relationship_continuity"]["ok"] is True
+    assert task.json()["id"] in checks["relationship_continuity"]["actual"]["retired_dispatch"]
+    assert checks["record_counts_non_decreasing"]["ok"] is True
 
 
 @pytest.mark.asyncio