diff --git a/tests/package_contract/test_agent_handoff_1_12.py b/tests/package_contract/test_agent_handoff_1_12.py
index 9f484340..9ad87ffb 100644
--- a/tests/package_contract/test_agent_handoff_1_12.py
+++ b/tests/package_contract/test_agent_handoff_1_12.py
@@ -152,9 +152,9 @@ def test_agent_handoff_1_12__launcher_and_projection__preserve_package_bytes() -
 
 def test_agent_handoff_1_12__mutable_navigation__names_the_new_authority() -> None:
     expected_links = {
-        _FAMILY / "README.md": "versions/1.16/README.md",
-        _FAMILY / "adopt.md": "versions/1.16/adopt.md",
-        _FAMILY / "agent-summary.md": "versions/1.16/agent-summary.md",
+        _FAMILY / "README.md": "versions/1.17/README.md",
+        _FAMILY / "adopt.md": "versions/1.17/adopt.md",
+        _FAMILY / "agent-summary.md": "versions/1.17/agent-summary.md",
     }
     for path, expected_link in expected_links.items():
         content = path.read_text(encoding="utf-8")
diff --git a/tests/package_contract/test_agent_handoff_1_15.py b/tests/package_contract/test_agent_handoff_1_15.py
index 3d3013f1..07c3c91f 100644
--- a/tests/package_contract/test_agent_handoff_1_15.py
+++ b/tests/package_contract/test_agent_handoff_1_15.py
@@ -139,7 +139,7 @@ def test_agent_handoff_1_15__identity__is_complete_and_current() -> None:
     }
     assert roles["1.14"] == "retained"
     assert roles["1.15"] == "retained"
-    assert "| [`agent-handoff`](agent-handoff/README.md) | active | 1.16 | default |" in (
+    assert "| [`agent-handoff`](agent-handoff/README.md) | active | 1.17 | default |" in (
         _ROOT / "standards/catalog.md"
     ).read_text(encoding="utf-8")
 
diff --git a/tests/package_contract/test_cut_successor.py b/tests/package_contract/test_cut_successor.py
index a86ebd55..8ffa498a 100644
--- a/tests/package_contract/test_cut_successor.py
+++ b/tests/package_contract/test_cut_successor.py
@@ -11,7 +11,6 @@
 
 from __future__ import annotations
 
-import importlib.util
 import shutil
 import tomllib
 from pathlib import Path
@@ -21,6 +20,7 @@
 from project_standards.cli import main
 from project_standards.package_contract.cut_successor import apply_cut, plan_cut
 from project_standards.package_contract.diagnostics import PackageContractError
+from tests.module_loading import load_module_from_path
 
 _ROOT = Path(__file__).resolve().parents[2]
 # python-coding is the smallest family in the repository (four payload files) and
@@ -54,10 +54,7 @@ def _next_version(repository: Path, standard_id: str) -> tuple[str, str]:
 
 def _run_module(path: Path) -> None:
     """Import one generated test module and run every test function it defines."""
-    spec = importlib.util.spec_from_file_location(path.stem, path)
-    assert spec is not None and spec.loader is not None
-    module = importlib.util.module_from_spec(spec)
-    spec.loader.exec_module(module)
+    module = load_module_from_path(path.stem, path)
     cases = [name for name in dir(module) if name.startswith("test_")]
     assert cases, f"scaffolded module defines no test: {path}"
     for name in cases:
diff --git a/tests/package_contract/test_github_workflow_1_9.py b/tests/package_contract/test_github_workflow_1_9.py
index 7819798f..4c602f5b 100644
--- a/tests/package_contract/test_github_workflow_1_9.py
+++ b/tests/package_contract/test_github_workflow_1_9.py
@@ -556,6 +556,14 @@ def _run_binary(args: Sequence[str], cwd: Path) -> subprocess.CompletedProcess[s
     )
 
 
+# The corpus this assertion measures is frozen at the last commit before the
+# `Workflow-Admission` classes started landing on `testing` (the v5.28.0 D4 adoption
+# commit). `HEAD` would drift: every legitimate `T0` or `handoff` commit admitted after
+# the floor would flip the zero counts below, turning a fixed-epoch measurement into a
+# prohibition on classes CLAUDE.md declares valid.
+_CORPUS_TIP = "4866a9fa"
+
+
 @_requires_binary
 def test_github_workflow_1_9__classifier__flags_this_repository_own_history() -> None:
     """The non-vacuity proof #203 requires, run over the corpus that motivated it.
@@ -571,7 +579,16 @@ def test_github_workflow_1_9__classifier__flags_this_repository_own_history() ->
     network reachability.
     """
     result = _run_binary(
-        ["admission", "--branch", "HEAD", "--since", "9c47907f", "--offline", "--output", "json"],
+        [
+            "admission",
+            "--branch",
+            _CORPUS_TIP,
+            "--since",
+            "9c47907f",
+            "--offline",
+            "--output",
+            "json",
+        ],
         cwd=_ROOT,
     )
     if result.returncode == 2 and "reading commits" in result.stdout + result.stderr:
diff --git a/tests/test_repository_hygiene.py b/tests/test_repository_hygiene.py
index c3ed05a4..9c8c7591 100644
--- a/tests/test_repository_hygiene.py
+++ b/tests/test_repository_hygiene.py
@@ -116,6 +116,7 @@
         "scripts/build-command-provider-fixture.sh",
         "scripts/build-gh-workflow.sh",
         "scripts/githooks/main-branch-guard",
+        "scripts/go-verify-stamp.sh",
         "scripts/install-githooks.sh",
         "scripts/wheel-runtime-stamp.sh",
     }
diff --git a/tests/test_spec_selected_routing.py b/tests/test_spec_selected_routing.py
index a2d040c0..0c93efe3 100644
--- a/tests/test_spec_selected_routing.py
+++ b/tests/test_spec_selected_routing.py
@@ -1197,8 +1197,10 @@ def test_selected_validate_uses_captured_bytes_if_path_changes_after_snapshot(
     def capture_then_swap(
         repo_root: Path,
         targets: tuple[SafeRelativePath, ...],
+        *,
+        retain_content: bool = True,
     ) -> RepositorySnapshot:
-        result = real_capture(repo_root, targets)
+        result = real_capture(repo_root, targets, retain_content=retain_content)
         if any(target.original == "victim.md" for target in targets):
             victim.unlink()
             victim.symlink_to(outside)