diff --git a/ci/scripts/publish_test_metrics.py b/ci/scripts/publish_test_metrics.py
index 744ee5e0..4dc6ced7 100644
--- a/ci/scripts/publish_test_metrics.py
+++ b/ci/scripts/publish_test_metrics.py
@@ -6,18 +6,11 @@ from __future__ import annotations
 import json
 import os
 from glob import glob
-from pathlib import Path
-import sys
 import urllib.error
 import urllib.request
 import xml.etree.ElementTree as ET
 
-try:
-    from ci.scripts import publish_test_metrics_quality as _quality_helpers
-except ModuleNotFoundError:
-    # Jenkins executes this file directly; keep sibling helper import working in that mode.
-    sys.path.insert(0, str(Path(__file__).resolve().parent))
-    import publish_test_metrics_quality as _quality_helpers
+from ci.scripts import publish_test_metrics_quality as _quality_helpers
 
 CANONICAL_CHECKS = _quality_helpers.CANONICAL_CHECKS
 _build_check_statuses = _quality_helpers._build_check_statuses
diff --git a/ci/tests/glue/test_ariadne_schedules.py b/ci/tests/glue/test_ariadne_schedules.py
new file mode 100644
index 00000000..9bf20ce8
--- /dev/null
+++ b/ci/tests/glue/test_ariadne_schedules.py
@@ -0,0 +1,90 @@
+"""Glue checks for Ariadne schedules exported to VictoriaMetrics."""
+
+from __future__ import annotations
+
+import os
+from datetime import datetime, timezone
+from pathlib import Path
+
+import requests
+import yaml
+
+
+CONFIG_PATH = Path(__file__).with_name("config.yaml")
+
+
+def _load_config() -> dict:
+    with CONFIG_PATH.open("r", encoding="utf-8") as handle:
+        return yaml.safe_load(handle) or {}
+
+
+def _query(promql: str) -> list[dict]:
+    vm_url = os.environ.get("VM_URL", "http://victoria-metrics-single-server:8428").rstrip("/")
+    response = requests.get(f"{vm_url}/api/v1/query", params={"query": promql}, timeout=10)
+    response.raise_for_status()
+    payload = response.json()
+    return payload.get("data", {}).get("result", [])
+
+
+def _expected_tasks() -> list[dict]:
+    cfg = _load_config()
+    tasks = cfg.get("ariadne_schedule_tasks", [])
+    assert tasks, "No Ariadne schedule tasks configured"
+    return tasks
+
+
+def _tracked_tasks(tasks: list[dict]) -> list[dict]:
+    tracked = [item for item in tasks if item.get("check_last_success")]
+    assert tracked, "No Ariadne schedule tasks are marked for success tracking"
+    return tracked
+
+
+def _task_regex(tasks: list[dict]) -> str:
+    return "|".join(item["task"] for item in tasks)
+
+
+def test_ariadne_schedule_series_exist():
+    tasks = _expected_tasks()
+    selector = _task_regex(tasks)
+    series = _query(f'ariadne_schedule_next_run_timestamp_seconds{{task=~"{selector}"}}')
+    seen = {item.get("metric", {}).get("task") for item in series}
+    missing = [item["task"] for item in tasks if item["task"] not in seen]
+    assert not missing, f"Missing next-run metrics for: {', '.join(missing)}"
+
+
+def test_ariadne_schedule_recent_success():
+    tasks = _tracked_tasks(_expected_tasks())
+    selector = _task_regex(tasks)
+    series = _query(f'ariadne_schedule_last_success_timestamp_seconds{{task=~"{selector}"}}')
+    seen = {item.get("metric", {}).get("task") for item in series}
+    missing = [item["task"] for item in tasks if item["task"] not in seen]
+    assert not missing, f"Missing last-success metrics for: {', '.join(missing)}"
+
+    now = datetime.now(timezone.utc)
+    age_by_task = {
+        item.get("metric", {}).get("task"): (now - datetime.fromtimestamp(float(item["value"][1]), tz=timezone.utc)).total_seconds() / 3600
+        for item in series
+    }
+    too_old = [
+        f"{task} ({age_by_task[task]:.1f}h > {item['max_success_age_hours']}h)"
+        for item in tasks
+        if (task := item["task"]) in age_by_task and age_by_task[task] > float(item["max_success_age_hours"])
+    ]
+    assert not too_old, "Ariadne schedules are stale: " + ", ".join(too_old)
+
+
+def test_ariadne_schedule_last_status_present_and_boolean():
+    tasks = _tracked_tasks(_expected_tasks())
+    selector = _task_regex(tasks)
+    series = _query(f'ariadne_schedule_last_status{{task=~"{selector}"}}')
+    seen = {item.get("metric", {}).get("task") for item in series}
+    missing = [item["task"] for item in tasks if item["task"] not in seen]
+    assert not missing, f"Missing last-status metrics for: {', '.join(missing)}"
+
+    invalid = []
+    for item in series:
+        task = item.get("metric", {}).get("task")
+        value = float(item["value"][1])
+        if value not in (0.0, 1.0):
+            invalid.append(f"{task}={value}")
+    assert not invalid, f"Unexpected Ariadne last-status values: {', '.join(invalid)}"
diff --git a/ci/tests/glue/test_glue_metrics.py b/ci/tests/glue/test_glue_metrics.py
index 0ed41be6..af34f19c 100644
--- a/ci/tests/glue/test_glue_metrics.py
+++ b/ci/tests/glue/test_glue_metrics.py
@@ -1,3 +1,5 @@
+"""Glue checks for the metrics the quality-gate publishes."""
+
 from __future__ import annotations
 
 import os
@@ -7,10 +9,7 @@ import requests
 import yaml
 
 
-VM_URL = os.environ.get(
-    "VM_URL",
-    "http://victoria-metrics-single-server.monitoring.svc.cluster.local:8428",
-).rstrip("/")
+VM_URL = os.environ.get("VM_URL", "http://victoria-metrics-single-server:8428").rstrip("/")
 CONFIG_PATH = Path(__file__).with_name("config.yaml")
 
 
@@ -26,26 +25,45 @@ def _query(promql: str) -> list[dict]:
     return payload.get("data", {}).get("result", [])
 
 
-def test_glue_metrics_present():
-    series = _query('kube_cronjob_labels{label_atlas_bstein_dev_glue="true"}')
-    assert series, "No glue cronjob label series found"
+def _expected_tasks() -> list[dict]:
+    cfg = _load_config()
+    tasks = cfg.get("ariadne_schedule_tasks", [])
+    assert tasks, "No Ariadne schedule tasks configured"
+    return tasks
 
 
-def test_glue_metrics_success_join():
-    query = (
-        "kube_cronjob_status_last_successful_time "
-        'and on(namespace,cronjob) kube_cronjob_labels{label_atlas_bstein_dev_glue="true"}'
-    )
-    series = _query(query)
-    assert series, "No glue cronjob last success series found"
+def _tracked_tasks(tasks: list[dict]) -> list[dict]:
+    tracked = [item for item in tasks if item.get("check_last_success")]
+    assert tracked, "No Ariadne schedule tasks are marked for success tracking"
+    return tracked
+
+
+def _task_regex(tasks: list[dict]) -> str:
+    return "|".join(item["task"] for item in tasks)
 
 
 def test_ariadne_schedule_metrics_present():
-    cfg = _load_config()
-    expected = cfg.get("ariadne_schedule_tasks", [])
-    if not expected:
-        return
-    series = _query("ariadne_schedule_next_run_timestamp_seconds")
-    tasks = {item.get("metric", {}).get("task") for item in series}
-    missing = [task for task in expected if task not in tasks]
+    tasks = _expected_tasks()
+    selector = _task_regex(tasks)
+    series = _query(f'ariadne_schedule_next_run_timestamp_seconds{{task=~"{selector}"}}')
+    seen = {item.get("metric", {}).get("task") for item in series}
+    missing = [item["task"] for item in tasks if item["task"] not in seen]
     assert not missing, f"Missing Ariadne schedule metrics for: {', '.join(missing)}"
+
+
+def test_ariadne_schedule_success_and_status_metrics_present():
+    tasks = _tracked_tasks(_expected_tasks())
+    selector = _task_regex(tasks)
+
+    success = _query(f'ariadne_schedule_last_success_timestamp_seconds{{task=~"{selector}"}}')
+    status = _query(f'ariadne_schedule_last_status{{task=~"{selector}"}}')
+
+    success_tasks = {item.get("metric", {}).get("task") for item in success}
+    status_tasks = {item.get("metric", {}).get("task") for item in status}
+    expected = {item["task"] for item in tasks}
+
+    missing_success = sorted(expected - success_tasks)
+    missing_status = sorted(expected - status_tasks)
+
+    assert not missing_success, f"Missing Ariadne success metrics for: {', '.join(missing_success)}"
+    assert not missing_status, f"Missing Ariadne status metrics for: {', '.join(missing_status)}"
diff --git a/testing/quality_contract.json b/testing/quality_contract.json
index 06741e18..29556c2d 100644
--- a/testing/quality_contract.json
+++ b/testing/quality_contract.json
@@ -1,5 +1,4 @@
 {
-  "scope_note": "Quality-gate LOC/naming/coverage checks apply to managed automation and testing modules only, not broad Flux/Kubernetes manifest trees.",
   "required_docs": [
     {
       "path": "README.md",
@@ -16,20 +15,27 @@
   ],
   "managed_modules": [
     "ci/scripts/publish_test_metrics.py",
-    "services/mailu/scripts/mailu_sync.py",
+    "ci/scripts/publish_test_metrics_quality.py",
     "testing/__init__.py",
     "testing/quality_contract.py",
     "testing/quality_docs.py",
     "testing/quality_hygiene.py",
     "testing/quality_coverage.py",
-    "testing/quality_gate.py"
+    "testing/quality_gate.py",
+    "ci/tests/glue/test_ariadne_schedules.py",
+    "ci/tests/glue/test_glue_metrics.py",
+    "testing/tests/test_publish_test_metrics.py",
+    "testing/tests/test_quality_contract.py",
+    "testing/tests/test_quality_gate.py"
   ],
   "lint_paths": [
     "ci/scripts/publish_test_metrics.py",
+    "ci/scripts/publish_test_metrics_quality.py",
     "ci/tests/glue",
     "scripts/tests",
     "services/comms/scripts/tests",
     "services/mailu/scripts/mailu_sync.py",
+    "testing/tests",
     "testing"
   ],
   "pytest_suites": {
@@ -70,6 +76,8 @@
       "hygiene",
       "unit",
       "coverage",
+      "sonarqube",
+      "ironbank",
       "glue"
     ]
   },
@@ -151,6 +159,7 @@
     "minimum_percent": 95.0,
     "tracked_files": [
       "ci/scripts/publish_test_metrics.py",
+      "ci/scripts/publish_test_metrics_quality.py",
       "testing/quality_contract.py",
       "testing/quality_docs.py",
       "testing/quality_hygiene.py",
diff --git a/testing/quality_coverage.py b/testing/quality_coverage.py
index a778bf56..78d6649f 100644
--- a/testing/quality_coverage.py
+++ b/testing/quality_coverage.py
@@ -8,6 +8,7 @@ from typing import Any
 
 
 def _load_percentages(xml_path: Path, root: Path) -> dict[str, float]:
+    """Load per-file line-rate percentages from a Cobertura XML report."""
     tree = ET.parse(xml_path)
     xml_root = tree.getroot()
     source_roots = [
@@ -36,7 +37,11 @@ def _load_percentages(xml_path: Path, root: Path) -> dict[str, float]:
 
 
 def run_check(contract: dict[str, Any], root: Path, xml_path: Path) -> list[str]:
-    """Return human-readable issues for tracked files below the coverage floor."""
+    """Return human-readable issues for tracked files below the coverage floor.
+
+    The report is intentionally per-file so a single weak module cannot hide
+    behind aggregate suite coverage.
+    """
     if not xml_path.exists():
         return [f"coverage xml missing: {xml_path.relative_to(root)}"]
 
@@ -56,3 +61,25 @@ def run_check(contract: dict[str, Any], root: Path, xml_path: Path) -> list[str]
             )
 
     return issues
+
+
+def compute_workspace_line_coverage(
+    contract: dict[str, Any],
+    root: Path,
+    xml_path: Path,
+) -> float:
+    """Compute mean line coverage across tracked files present in the XML."""
+
+    if not xml_path.exists():
+        return 0.0
+
+    percentages = _load_percentages(xml_path, root)
+    samples: list[float] = []
+    for relative_path in contract.get("coverage", {}).get("tracked_files", []):
+        normalized = relative_path.replace("\\", "/")
+        percent = percentages.get(normalized)
+        if percent is not None:
+            samples.append(percent)
+    if not samples:
+        return 0.0
+    return round(sum(samples) / len(samples), 3)
diff --git a/testing/quality_gate.py b/testing/quality_gate.py
index edb0c1b3..320d1466 100644
--- a/testing/quality_gate.py
+++ b/testing/quality_gate.py
@@ -16,9 +16,15 @@ from pathlib import Path
 from typing import Any
 
 from testing.quality_contract import load_contract
-from testing.quality_coverage import run_check as run_coverage_check
+from testing.quality_coverage import (
+    compute_workspace_line_coverage,
+    run_check as run_coverage_check,
+)
 from testing.quality_docs import run_check as run_docs_check
-from testing.quality_hygiene import run_check as run_hygiene_check
+from testing.quality_hygiene import (
+    count_files_over_line_limit,
+    run_check as run_hygiene_check,
+)
 
 
 RUFF_SELECT = ["F", "B", "SIM", "C4", "UP"]
@@ -209,14 +215,17 @@ def _run_ironbank_check(build_dir: Path) -> dict[str, Any]:
 
 
 def _status_from_issues(issues: list[str]) -> str:
+    """Map an issue list to the gate status string."""
     return "ok" if not issues else "failed"
 
 
 def _result(name: str, description: str, status: str, **extra: Any) -> dict[str, Any]:
+    """Build a JSON-serializable result record for the summary payload."""
     return {"name": name, "description": description, "status": status, **extra}
 
 
 def _run_ruff(contract: dict[str, Any], root: Path) -> dict[str, Any]:
+    """Run the pedantic ruff subset against the contract's lint paths."""
     command = [
         sys.executable,
         "-m",
@@ -241,6 +250,7 @@ def _run_ruff(contract: dict[str, Any], root: Path) -> dict[str, Any]:
 
 
 def _run_pytest_suite(root: Path, suite_name: str, suite: dict[str, Any]) -> dict[str, Any]:
+    """Run a pytest suite and collect junit/coverage artifact locations."""
     junit_path = root / suite["junit"]
     junit_path.parent.mkdir(parents=True, exist_ok=True)
     command = [
@@ -340,11 +350,23 @@ def run_profile(
         results.append(_run_pytest_suite(root, check_name, suite))
 
     status = "ok" if all(item["status"] == "ok" for item in results) else "failed"
+    workspace_line_coverage_percent = 0.0
+    if "coverage" in profiles[profile_name]:
+        unit_suite = contract.get("pytest_suites", {}).get("unit", {})
+        coverage_xml_rel = unit_suite.get("coverage_xml")
+        if coverage_xml_rel:
+            workspace_line_coverage_percent = compute_workspace_line_coverage(
+                contract,
+                root,
+                root / coverage_xml_rel,
+            )
     return {
         "profile": profile_name,
         "status": status,
         "results": results,
         "manual_scripts": contract.get("manual_scripts", []),
+        "workspace_line_coverage_percent": workspace_line_coverage_percent,
+        "source_lines_over_500": count_files_over_line_limit(contract, root),
     }
 
 
@@ -365,5 +387,5 @@ def main(argv: list[str] | None = None) -> int:
     return 0 if summary["status"] == "ok" else 1
 
 
-if __name__ == "__main__":  # pragma: no cover - exercised via CLI execution
+if __name__ == "__main__":
     raise SystemExit(main())
diff --git a/testing/quality_hygiene.py b/testing/quality_hygiene.py
index de93fc6d..629f2096 100644
--- a/testing/quality_hygiene.py
+++ b/testing/quality_hygiene.py
@@ -9,6 +9,7 @@ from typing import Any
 
 
 def _expand_globs(root: Path, patterns: Iterable[str]) -> list[Path]:
+    """Expand a set of relative glob patterns to unique file paths."""
     matched: set[Path] = set()
     for pattern in patterns:
         matched.update(path for path in root.glob(pattern) if path.is_file())
@@ -29,9 +30,24 @@ def run_check(contract: dict[str, Any], root: Path) -> list[str]:
     for rule in config.get("naming_rules", []):
         pattern = re.compile(rule["pattern"])
         for path in _expand_globs(root, [rule["glob"]]):
+            if path.name == "conftest.py":
+                continue
             if not pattern.match(path.name):
                 issues.append(
                     f"naming rule failed ({rule['description']}): {path.relative_to(root)}"
                 )
 
     return issues
+
+
+def count_files_over_line_limit(contract: dict[str, Any], root: Path) -> int:
+    """Return the number of managed files that exceed the configured LOC cap."""
+
+    config = contract.get("hygiene", {})
+    max_lines = int(config.get("max_lines", 500))
+    count = 0
+    for path in _expand_globs(root, config.get("line_limit_globs", [])):
+        line_count = sum(1 for _ in path.open("r", encoding="utf-8"))
+        if line_count > max_lines:
+            count += 1
+    return count
diff --git a/testing/tests/test_publish_test_metrics_quality.py b/testing/tests/test_publish_test_metrics_quality.py
new file mode 100644
index 00000000..2b6d2cb7
--- /dev/null
+++ b/testing/tests/test_publish_test_metrics_quality.py
@@ -0,0 +1,105 @@
+"""Focused tests for publish_test_metrics quality helper fallbacks."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from ci.scripts import publish_test_metrics_quality as quality_helpers
+
+
+def test_infer_workspace_coverage_percent_handles_candidate_paths_and_parse_failures(tmp_path: Path) -> None:
+    """Coverage inference should honor explicit XML hints and fail closed on bad XML."""
+
+    build_dir = tmp_path / "build"
+    build_dir.mkdir()
+
+    coverage_xml = build_dir / "custom-coverage.xml"
+    coverage_xml.write_text('<coverage line-rate="0.975" />', encoding="utf-8")
+    summary = {"results": [None, {"name": "coverage", "coverage_xml": str(coverage_xml)}]}
+    assert quality_helpers._infer_workspace_coverage_percent(summary, "build/default.xml") == 97.5
+
+    missing_xml = build_dir / "missing.xml"
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(missing_xml)) == 0.0
+
+    no_rate_xml = build_dir / "no-rate.xml"
+    no_rate_xml.write_text("<coverage />", encoding="utf-8")
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(no_rate_xml)) == 0.0
+
+    bad_xml = build_dir / "bad.xml"
+    bad_xml.write_text("<coverage", encoding="utf-8")
+    assert quality_helpers._infer_workspace_coverage_percent({}, str(bad_xml)) == 0.0
+
+
+def test_infer_source_lines_over_500_counts_only_string_hygiene_issues() -> None:
+    """LOC inference should ignore non-lists and only count explicit over-limit strings."""
+
+    summary = {
+        "results": [
+            None,
+            {"name": "docs", "issues": ["ignore me"]},
+            {"name": "loc", "issues": "not-a-list"},
+            {
+                "name": "hygiene",
+                "issues": [
+                    "file exceeds 500 LOC: alpha.py (501)",
+                    42,
+                    "naming rule failed: beta.py",
+                    "file exceeds 500 LOC: gamma.py (650)",
+                ],
+            },
+        ]
+    }
+
+    assert quality_helpers._infer_source_lines_over_500(summary) == 2
+
+
+def test_build_check_statuses_uses_fallbacks_for_tests_docs_and_gate_glue() -> None:
+    """Fallback status synthesis should derive missing checks from related signals."""
+
+    statuses = quality_helpers._build_check_statuses(
+        summary={
+            "results": [
+                {"name": "docs", "status": "ok"},
+                {"name": "smell", "status": "ok"},
+                {"name": "gate", "status": "warning"},
+            ]
+        },
+        tests={"tests": 3, "failures": 1, "errors": 0, "skipped": 0},
+        workspace_line_coverage_percent=0.0,
+        source_lines_over_500=0,
+        sonarqube_report={},
+        supply_chain_report={},
+        supply_chain_required=False,
+    )
+
+    assert statuses["tests"] == "failed"
+    assert statuses["coverage"] == "not_applicable"
+    assert statuses["loc"] == "ok"
+    assert statuses["docs_naming"] == "ok"
+    assert statuses["gate_glue"] == "failed"
+
+
+def test_build_check_statuses_preserves_explicit_loc_docs_and_glue_results() -> None:
+    """Explicit canonical statuses should win over fallback inference."""
+
+    statuses = quality_helpers._build_check_statuses(
+        summary={
+            "results": [
+                {"name": "loc", "status": "ok"},
+                {"name": "docs_naming", "status": "ok"},
+                {"name": "gate_glue", "status": "ok"},
+            ]
+        },
+        tests={"tests": 0, "failures": 0, "errors": 0, "skipped": 0},
+        workspace_line_coverage_percent=96.0,
+        source_lines_over_500=9,
+        sonarqube_report={},
+        supply_chain_report={},
+        supply_chain_required=False,
+    )
+
+    assert statuses["tests"] == "not_applicable"
+    assert statuses["coverage"] == "ok"
+    assert statuses["loc"] == "ok"
+    assert statuses["docs_naming"] == "ok"
+    assert statuses["gate_glue"] == "ok"
diff --git a/testing/tests/test_quality_contract.py b/testing/tests/test_quality_contract.py
index e5f97d00..6e260a1b 100644
--- a/testing/tests/test_quality_contract.py
+++ b/testing/tests/test_quality_contract.py
@@ -1,3 +1,5 @@
+"""Unit tests for the repository testing contract helpers."""
+
 from __future__ import annotations
 
 from pathlib import Path
@@ -16,18 +18,6 @@ def test_bundled_contract_exposes_local_and_jenkins_profiles():
     assert contract["pytest_suites"]["unit"]["paths"]
 
 
-def test_bundled_contract_keeps_monorepo_manifest_trees_out_of_hygiene_scope():
-    contract = load_contract()
-    required_doc_paths = {item["path"] for item in contract.get("required_docs", [])}
-    assert "AGENTS.md" not in required_doc_paths
-
-    globs = contract.get("hygiene", {}).get("line_limit_globs", [])
-    assert globs
-    for entry in globs:
-        assert entry.startswith(("testing/", "ci/", "scripts/tests/", "services/"))
-        assert "/scripts/" in entry or not entry.startswith("services/")
-
-
 def test_docs_check_reports_missing_docstring_and_missing_path(tmp_path: Path):
     module_path = tmp_path / "managed.py"
     module_path.write_text("value = 1\n", encoding="utf-8")
diff --git a/testing/tests/test_quality_coverage_helpers.py b/testing/tests/test_quality_coverage_helpers.py
new file mode 100644
index 00000000..5eaa624e
--- /dev/null
+++ b/testing/tests/test_quality_coverage_helpers.py
@@ -0,0 +1,76 @@
+"""Focused coverage-helper tests for titan-iac quality modules."""
+
+from __future__ import annotations
+
+import textwrap
+from pathlib import Path
+
+from testing.quality_coverage import compute_workspace_line_coverage, run_check
+
+
+def test_compute_workspace_line_coverage_handles_missing_xml(tmp_path: Path) -> None:
+    """Missing coverage XML should produce a zero workspace coverage score."""
+
+    contract = {"coverage": {"tracked_files": ["managed.py"]}}
+    assert compute_workspace_line_coverage(contract, tmp_path, tmp_path / "missing.xml") == 0.0
+
+
+def test_compute_workspace_line_coverage_averages_present_tracked_files(tmp_path: Path) -> None:
+    """Workspace coverage should average only tracked files that appear in the report."""
+
+    coverage_xml = tmp_path / "coverage.xml"
+    coverage_xml.write_text(
+        textwrap.dedent(
+            """\
+            <coverage>
+              <packages>
+                <package>
+                  <classes>
+                    <class filename="alpha.py" line-rate="1.0" />
+                    <class filename="beta.py" line-rate="0.5" />
+                  </classes>
+                </package>
+              </packages>
+            </coverage>
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    contract = {"coverage": {"tracked_files": ["alpha.py", "beta.py", "missing.py"]}}
+    assert compute_workspace_line_coverage(contract, tmp_path, coverage_xml) == 75.0
+
+
+def test_run_check_keeps_relative_names_when_source_roots_do_not_match(tmp_path: Path) -> None:
+    """Relative filenames should remain relative when no declared source root contains them."""
+
+    coverage_xml = tmp_path / "coverage.xml"
+    unmatched_root = tmp_path / "other-root"
+    unmatched_root.mkdir()
+    coverage_xml.write_text(
+        textwrap.dedent(
+            f"""\
+            <coverage>
+              <sources>
+                <source>{unmatched_root}</source>
+              </sources>
+              <packages>
+                <package>
+                  <classes>
+                    <class filename="relative.py" line-rate="0.80" />
+                  </classes>
+                </package>
+              </packages>
+            </coverage>
+            """
+        ),
+        encoding="utf-8",
+    )
+
+    issues = run_check(
+        {"coverage": {"minimum_percent": 95.0, "tracked_files": ["relative.py"]}},
+        tmp_path,
+        coverage_xml,
+    )
+
+    assert issues == ["coverage below 95.0%: relative.py (80.0%)"]
diff --git a/testing/tests/test_quality_gate.py b/testing/tests/test_quality_gate.py
index a1a1b918..256a78e6 100644
--- a/testing/tests/test_quality_gate.py
+++ b/testing/tests/test_quality_gate.py
@@ -1,3 +1,5 @@
+"""Unit tests for the top-level quality-gate runner."""
+
 from __future__ import annotations
 
 from pathlib import Path
@@ -52,6 +54,8 @@ def test_run_profile_aggregates_internal_and_pytest_results(tmp_path: Path, monk
         "unit",
         "coverage",
     ]
+    assert summary["workspace_line_coverage_percent"] == 0.0
+    assert summary["source_lines_over_500"] == 0
     assert calls[0][0][:3] == [quality_gate.sys.executable, "-m", "ruff"]
     assert any(result.get("junit") == "build/junit-unit.xml" for result in summary["results"])
 
diff --git a/testing/tests/test_quality_hygiene_helpers.py b/testing/tests/test_quality_hygiene_helpers.py
new file mode 100644
index 00000000..a303c650
--- /dev/null
+++ b/testing/tests/test_quality_hygiene_helpers.py
@@ -0,0 +1,26 @@
+"""Focused hygiene-helper tests for titan-iac quality modules."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from testing.quality_hygiene import count_files_over_line_limit
+
+
+def test_count_files_over_line_limit_counts_only_long_matches(tmp_path: Path) -> None:
+    """Only files beyond the configured limit should contribute to the LOC total."""
+
+    tests_dir = tmp_path / "tests"
+    tests_dir.mkdir()
+    (tests_dir / "test_short.py").write_text("line\n", encoding="utf-8")
+    (tests_dir / "test_long.py").write_text("line\n" * 4, encoding="utf-8")
+    (tests_dir / "notes.txt").write_text("line\n" * 8, encoding="utf-8")
+
+    contract = {
+        "hygiene": {
+            "max_lines": 3,
+            "line_limit_globs": ["tests/*.py"],
+        }
+    }
+
+    assert count_files_over_line_limit(contract, tmp_path) == 1