test: review round 2 of Issue #71 (line breaks, unreadable registry, shim anchor)

- parity and create with real line breaks in the name;
- stop with malformed YAML (no DB) or a corrupt DB refuses (exit 1);
- test_layout: the shim heredoc anchor follows the { ... } > "$tmp_file"
  form (the rule it checks is unchanged);
- S11: base re-pinned to 0fc162e, which changes the shim's sanitize body.

Refs #71

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_issue71_herdr_names.py

@@ -30,6 +30,7 @@ LONG = "lab-issue71-a-very-long-branch-name-creator-claude"   # > 32 characters
 UPPER = "Lab-Upper-creator-claude"
 PLAIN = "lab-plain-creator-claude"                             # needs no conversion
 UNI = "\u0130stanbul-creator-claude"                           # str.lower() differs from tr here
+NL = "newline-creator-claude\n"                                 # $(...) would drop the line break
 STOP = "bash .agents/skills/multi-agent-mux-stop/scripts/stop_session.sh"
 
 
@@ -78,7 +79,7 @@ def _assert_new_form(row, server):
     assert "kill_command" not in row and "start_command" not in row
 
 
-@pytest.mark.parametrize("name", [LONG, UPPER, PLAIN, UNI])
+@pytest.mark.parametrize("name", [LONG, UPPER, PLAIN, UNI, NL])
 @pytest.mark.parametrize("server", ["default", "mam-iso71"])
 def test_create_writes_the_attach_command(mam_sandbox, mock_herdr, mock_agents, name, server):
     _set_mock(mock_herdr, strict_agent_names=True)
@@ -161,9 +162,10 @@ def test_wrapper_attach_calls_herdr_with_the_herdr_name(mam_sandbox, mock_herdr,
 # --- one sanitize rule ----------------------------------------------------------
 
 NAMES = ["", "plain", "Upper-Case", "9lead", "-dash", "has space/and.dot", "x" * 32, "y" * 33,
-         LONG, LONG.upper(), "creator-claude-fix-issue-99-long-branch", "-n", "-e", "a\\nb"]
+         LONG, LONG.upper(), "creator-claude-fix-issue-99-long-branch", "-n", "-e", "a\\nb",
+         NL, "a\nb", "\n", "x\r\ny", "Up\nper"]
 UNI_NAMES = [UNI, "caf\u00e9-creator-claude", "\u00fc" * 40, "kelvin-\u212a", "\u65e5\u672c-creator-claude",
-             "\u0130" * 20 + "-creator-claude"]
+             "\u0130" * 20 + "-creator-claude", "\u00fc\n"]
 
 
 def test_lib_sh_has_one_definition():
@@ -509,6 +511,28 @@ def test_stop_does_not_take_an_unreadable_row_for_no_row(mam_sandbox, mock_herdr
     assert "orphan74" in json.loads(Path(mock_herdr).read_text())["agents"]
 
 
+@pytest.mark.parametrize("broken", ["yaml-without-db", "db"])
+def test_stop_does_not_take_an_unreadable_registry_for_no_row(mam_sandbox, mock_herdr, broken):
+    """load_state_json's {} on a read error is not "no row": a registered session is not closed row-less."""
+    name = "orphan75-creator-claude"
+    _seed(mam_sandbox, [{"name": name, "status": "running", "role": "creator", "agent": "claude",
+                         "pane": {"cwd": str(mam_sandbox), "cmd": "claude"}}])
+    mam = mam_sandbox / ".mam"
+    if broken == "yaml-without-db":
+        for f in mam.glob("agent-sessions.db*"):
+            f.unlink()
+        (mam / "agent-sessions.yaml").write_text("herdr_sessions: [\n  - {name: " + name + "\n")
+    else:
+        for f in mam.glob("agent-sessions.db-*"):
+            f.unlink()
+        (mam / "agent-sessions.db").write_bytes(b"this is not a database" * 64)
+    _set_mock(mock_herdr, agents={name: _agent(mam_sandbox, "w1:p76")})
+    res = _stop(mam_sandbox, name)
+    assert res.returncode == 1, res.stdout + res.stderr
+    assert "cannot read" in res.stderr and "no registry row" not in res.stdout
+    assert name in json.loads(Path(mock_herdr).read_text())["agents"]
+
+
 def test_stop_without_a_row_purges_nothing(mam_sandbox, mock_herdr, registry_with_a_row):
     _set_mock(mock_herdr, agents={"orphan72": _agent(mam_sandbox, "w1:p73")})
     res = _stop(mam_sandbox, "orphan72", "--purge-conversation", "--yes")