diff --git a/.github/workflows/agent-mention-router-quality-ci.yml b/.github/workflows/agent-mention-router-quality-ci.yml
index 9c36a89119..4e943d74f2 100644
--- a/.github/workflows/agent-mention-router-quality-ci.yml
+++ b/.github/workflows/agent-mention-router-quality-ci.yml
@@ -14,6 +14,7 @@ on:
       - "tests/test_agent_mention_*.py"
       - "tests/test_pr_review_fix_scheduler_coverage.py"
       - "requirements-opencode-review-ci-hashes.txt"
+      - "requirements-noema-document-ci-hashes.txt"
   push:
     branches: [main]
     paths:
@@ -27,6 +28,7 @@ on:
       - "tests/test_agent_mention_*.py"
       - "tests/test_pr_review_fix_scheduler_coverage.py"
       - "requirements-opencode-review-ci-hashes.txt"
+      - "requirements-noema-document-ci-hashes.txt"
 
 concurrency:
   group: agent-mention-router-quality-${{ github.repository }}-${{ github.event.pull_request.number || github.ref }}
@@ -85,11 +87,14 @@ jobs:
         with:
           python-version: "3.14"
           cache: pip
-          cache-dependency-path: requirements-opencode-review-ci-hashes.txt
+          cache-dependency-path: |
+            requirements-opencode-review-ci-hashes.txt
+            requirements-noema-document-ci-hashes.txt
       - name: Install exact hash-locked tooling
         run: >-
           python -m pip install --disable-pip-version-check --require-hashes
           -r requirements-opencode-review-ci-hashes.txt
+          -r requirements-noema-document-ci-hashes.txt
       - name: Run complete repository suite and bounded branch coverage
         shell: bash --noprofile --norc -e -o pipefail {0}
         run: |
diff --git a/.jules/bolt.md b/.jules/bolt.md
index 4f20b36047..088c43d3f8 100644
--- a/.jules/bolt.md
+++ b/.jules/bolt.md
@@ -54,3 +54,7 @@
 ## 2026-09-01 - 대용량 문자열 서브스트링 스캐닝 루프 최적화
 **Learning:** 긴 텍스트에서 여러 기준 문자열(`candidate`)을 탐색하여 다음 구역의 시작점을 찾을 때, 텍스트 전체에 대해 반복적으로 `text.find(candidate)`를 호출하면 O(N)의 비효율적인 중복 스캐닝 오버헤드가 발생합니다. 특히 가장 가까운 시작점을 찾기 위해 모든 후보를 스캔할 때 이 문제가 심화됩니다.
 **Action:** 기준점(`start`)을 잡은 후, `idx = text.find(candidate, start, end)`를 사용하여 검색 범위를 동적으로 축소(`end = min(end, idx)`)하십시오. 이렇게 하면 불필요한 스캐닝 오버헤드를 막고 검색 범위를 안전하게 줄여 매우 큰 성능 향상을 얻을 수 있습니다.
+
+## 2026-09-17 - ThreadPoolExecutor shutdown latency
+**Learning:** Using `executor.shutdown(wait=False)` to speed up generator cleanup (e.g. `list_recent_pull_requests`) inside a Python script only hides the blocking until process exit. CPython will still forcefully join all non-daemon worker threads when terminating, so the overall job wall-clock time is not reduced, and the GitHub API requests continue running unconstrained in the background until completion or network timeout.
+**Action:** Do not use `wait=False` micro-optimizations to abandon running I/O workers. Instead, rely on cooperative cancellation (e.g., passing a `threading.Event` to interrupt network waits) so workers cleanly abort, allowing both the generator and the interpreter to exit quickly.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 34281625cb..b8c5d19aa2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -96,6 +96,12 @@
 - Raised `hourly-review-repair.yml`'s discovery ceiling from 50 to 200 while rotating deterministic 50-PR deep-inspection windows by hourly run number. The scheduler hydrates only the selected window and stops immediately after its single dispatch, preserving access to newer PRs without quadrupling expensive review/check/comment work. See `docs/doctoring/hourly-review-repair-single-file-consolidation.md`'s 2026-09-03 follow-up.
 
 ## [Unreleased]
+- **Repair the Agent Mention full-suite dependency closure.** The quality
+  workflow now triggers on, caches, and installs both the OpenCode and Noema
+  hash locks, so repository-wide collection can import `defusedxml`. The
+  stale `ThreadPoolExecutor.shutdown(wait=False)` proposal is removed because
+  CPython still joins those workers at process exit while the early return
+  would let GitHub API work continue after generator cleanup.
 - **Bind GitHub REST redirect evidence to both production opener chains.** `.github#2279` now feeds a synthetic same-authority 302 through the CodeQL identity and Strix evidence clients' real module-level openers, proving the redirect target is never contacted and the bearer header is never forwarded. Removing `_RejectRedirects` from either opener makes the contract fail on the forbidden second request. Four stale Strix HTTP/transport/JSON fixtures now patch that same production seam; direct handler unit cases and standalone CodeQL materialization remain unchanged.
 - **Define an evidence-backed repository README quality standard.** Added `docs/repository-readme-quality-standard.md` as the shared review contract for product-first structure, code-current onboarding, authority boundaries, durable quality signals, and repository/source/dependency license due diligence. Product repositories continue to own their own README prose; the standard is linked from the root documentation map and does not centralize or generate product claims.
 - Include merge-scheduler entrypoint, core, and regression-test changes in
diff --git a/scripts/ci/agent_mention_router.py b/scripts/ci/agent_mention_router.py
index 68e544a6cf..81a7cf510c 100755
--- a/scripts/ci/agent_mention_router.py
+++ b/scripts/ci/agent_mention_router.py
@@ -10,6 +10,7 @@
 import os
 import re
 import subprocess
+import threading
 import time
 from dataclasses import dataclass
 from typing import Any, Sequence
@@ -150,6 +151,7 @@ def request(
         args: Sequence[str],
         *,
         input_payload: dict[str, Any] | None = None,
+        cancellation_event: threading.Event | None = None,
     ) -> Any:
         """Execute one bounded ``gh api`` request and decode optional JSON.
 
@@ -176,6 +178,8 @@ def request(
         payload = None if input_payload is None else json.dumps(input_payload)
         attempt = 0
         while True:
+            if cancellation_event is not None and cancellation_event.is_set():
+                raise RuntimeError("gh api request cancelled")
             attempt += 1
             try:
                 completed = subprocess.run(
@@ -193,6 +197,8 @@ def request(
                     "gh api timed out after "
                     f"{GITHUB_API_TIMEOUT_SECONDS} seconds"
                 ) from exc
+            if cancellation_event is not None and cancellation_event.is_set():
+                raise RuntimeError("gh api request cancelled")
             return_code = int(getattr(completed, "returncode", 0))
             if not return_code:
                 output = completed.stdout.strip()
@@ -202,7 +208,11 @@ def request(
                 diagnostic = "no stderr output"
             retryable = RATE_LIMIT_DIAGNOSTIC_RE.search(diagnostic) is not None
             if retryable and attempt < GITHUB_API_MAX_ATTEMPTS:
-                time.sleep(attempt * 5)
+                backoff_seconds = attempt * 5
+                if cancellation_event is None:
+                    time.sleep(backoff_seconds)
+                elif cancellation_event.wait(backoff_seconds):
+                    raise RuntimeError("gh api request cancelled")
                 continue
             suffix = f" after {attempt} attempts" if attempt > 1 else ""
             raise RuntimeError(
diff --git a/scripts/ci/agent_mention_sweep.py b/scripts/ci/agent_mention_sweep.py
index 5b56fdcf4f..c969d16442 100755
--- a/scripts/ci/agent_mention_sweep.py
+++ b/scripts/ci/agent_mention_sweep.py
@@ -31,16 +31,12 @@
 # log tail and metrics. Stop dispatching new work with margin to spare so
 # the sweep exits cleanly and reports what it completed.
 #
-# Returning early only stops NEW work: list_recent_pull_requests' generator
-# cleanup still blocks (executor.shutdown(wait=True)) until every currently
-# RUNNING repository fetch finishes on its own. GitHubClient's rate-limit
-# retry costs up to ~255s worst case for one repository (six attempts, each
-# up to the 30s subprocess timeout, plus ~75s of backoff between them), and
-# up to max_workers of those can be running concurrently at the moment the
-# deadline trips (bounded by that ceiling, not multiplied by it, since they
-# run in parallel). Budget = 900s job timeout - ~60s setup/checkout
-# overhead - ~255s worst-case cleanup wait, with a further margin still
-# unspent.
+# Returning early sets one cancellation event shared by repository fetches.
+# That event interrupts retry backoff immediately; an already-running gh
+# subprocess retains its existing 30s timeout. Cleanup then waits for those
+# bounded workers before returning, so no worker can keep using the shared
+# client after the sweep reports completion. The 480s dispatch budget leaves
+# the 30s worker tail plus setup and reporting margin inside the 900s job.
 DEFAULT_TIME_BUDGET_SECONDS = 480.0
 
 
@@ -204,7 +200,8 @@ def fetch(repository: str) -> list[dict[str, Any]]:
                     "per_page=100",
                     "-f",
                     f"page={page}",
-                ]
+                ],
+                cancellation_event=stop_event,
             )
             pull_requests = flatten_pages(response)
             if not pull_requests:
diff --git a/tests/test_agent_mention_sweep.py b/tests/test_agent_mention_sweep.py
index 1489873b76..f075098923 100644
--- a/tests/test_agent_mention_sweep.py
+++ b/tests/test_agent_mention_sweep.py
@@ -23,9 +23,10 @@ def __init__(self, responses=None) -> None:
         self.responses = responses or {}
         self.calls = []
 
-    def request(self, args, *, input_payload=None):
+    def request(self, args, *, input_payload=None, cancellation_event=None):
         """Return the response registered for the first API argument."""
 
+        del cancellation_event
         self.calls.append((list(args), input_payload))
         return self.responses.get(args[0])
 
@@ -677,3 +678,56 @@ def test_main_constructs_clients_and_forwards_options(monkeypatch) -> None:
     assert captured[0]["lookback_hours"] == 48
     assert captured[0]["max_dispatches"] == 3
     assert captured[0]["dry_run"] is True
+
+def test_list_recent_pull_requests_shutdown_behavior(monkeypatch) -> None:
+    """Generator cleanup cancels workers and joins them before returning."""
+
+    sweep = module()
+    client = FakeClient()
+    monkeypatch.setattr(
+        sweep, "list_accessible_repositories", lambda *args, **kwargs: ["ContextualWisdomLab/repo", "ContextualWisdomLab/repo2"]
+    )
+
+    import concurrent.futures
+    import threading
+    shutdown_called_with_wait = False
+
+    # We need a latch to ensure the worker starts running before we close.
+    worker_started = threading.Event()
+    worker_can_finish = threading.Event()
+
+    def fake_request(args, *, input_payload=None, cancellation_event=None):
+        del input_payload
+        endpoint = args[0]
+        if endpoint.endswith("repo2/pulls"):
+            worker_started.set()
+            assert cancellation_event is not None
+            cancellation_event.wait(timeout=5)
+            worker_can_finish.set()
+            return []
+        assert worker_started.wait(timeout=2)
+        return [{"number": 1, "updated_at": "2026-08-05T00:00:00Z"}]
+
+    monkeypatch.setattr(client, "request", fake_request)
+
+    class MockExecutor(concurrent.futures.ThreadPoolExecutor):
+        def shutdown(self, wait=True, cancel_futures=False):
+            nonlocal shutdown_called_with_wait
+            if wait and cancel_futures:
+                shutdown_called_with_wait = True
+            super().shutdown(wait=wait, cancel_futures=cancel_futures)
+
+    monkeypatch.setattr(concurrent.futures, "ThreadPoolExecutor", MockExecutor)
+
+    gen = sweep.list_recent_pull_requests(
+        client,
+        organization="ContextualWisdomLab",
+        repository_source="organization",
+        since="2026-08-05T00:00:00Z",
+    )
+
+    assert next(gen)["number"] == 1
+    assert worker_started.is_set()
+    gen.close()
+    assert shutdown_called_with_wait
+    assert worker_can_finish.is_set()
diff --git a/tests/test_agent_mention_sweep_regressions.py b/tests/test_agent_mention_sweep_regressions.py
index 643f562cc0..4992b018d7 100644
--- a/tests/test_agent_mention_sweep_regressions.py
+++ b/tests/test_agent_mention_sweep_regressions.py
@@ -40,10 +40,10 @@ def __init__(self, responses) -> None:
         self.responses = responses
         self.calls: list[list[str]] = []
 
-    def request(self, args, *, input_payload=None):
+    def request(self, args, *, input_payload=None, cancellation_event=None):
         """Return one endpoint/page response or raise its configured error."""
 
-        del input_payload
+        del input_payload, cancellation_event
         args = list(args)
         self.calls.append(args)
         endpoint = args[0]
diff --git a/tests/test_agent_mention_timeout_bounds.py b/tests/test_agent_mention_timeout_bounds.py
index 7f294cb259..050c1b9786 100644
--- a/tests/test_agent_mention_timeout_bounds.py
+++ b/tests/test_agent_mention_timeout_bounds.py
@@ -54,10 +54,10 @@ def __init__(self, names: tuple[str, ...]) -> None:
 
         self.names = names
 
-    def request(self, args, *, input_payload=None):
+    def request(self, args, *, input_payload=None, cancellation_event=None):
         """Return the organization inventory or one repository pull list."""
 
-        del input_payload
+        del input_payload, cancellation_event
         endpoint = args[0]
         if endpoint == "orgs/ContextualWisdomLab/repos":
             return [repository(name) for name in self.names]
@@ -128,6 +128,99 @@ def flaky_run(command, **kwargs):
     assert sleeps == [5, 10]
 
 
+def test_github_client_cancellation_interrupts_rate_limit_backoff(monkeypatch) -> None:
+    """Sweep cancellation stops a retrying request before another subprocess."""
+
+    router = router_module()
+    attempts = []
+    waits = []
+
+    def rate_limited(command, **kwargs):
+        """Return one admission-time rate-limit response."""
+        del kwargs
+        attempts.append(command)
+        return SimpleNamespace(
+            stdout="",
+            stderr="gh: API rate limit exceeded for installation ID 1",
+            returncode=1,
+        )
+
+    class CancellationEvent:
+        """Expose the Event subset required by the request boundary."""
+
+        cancelled = False
+
+        def is_set(self) -> bool:
+            """Return whether the synthetic cancellation was observed."""
+            return self.cancelled
+
+        def wait(self, timeout: float) -> bool:
+            """Record the backoff and interrupt it immediately."""
+            waits.append(timeout)
+            self.cancelled = True
+            return True
+
+    monkeypatch.setattr(router.subprocess, "run", rate_limited)
+    with pytest.raises(RuntimeError, match="gh api request cancelled"):
+        router.GitHubClient("token").request(
+            ["repos/x/y"],
+            cancellation_event=CancellationEvent(),
+        )
+
+    assert len(attempts) == 1
+    assert waits == [5]
+
+
+def test_sweep_process_exits_after_cooperative_worker_cancellation() -> None:
+    """Closing the real sweep generator also bounds interpreter shutdown."""
+
+    child_program = f'''
+import sys
+import threading
+import time
+sys.path.insert(0, {str(SCRIPTS)!r})
+import agent_mention_sweep as sweep
+
+worker_started = threading.Event()
+
+class Client:
+    def request(self, args, *, input_payload=None, cancellation_event=None):
+        del input_payload
+        endpoint = args[0]
+        if endpoint == "orgs/ContextualWisdomLab/repos":
+            return [
+                {{"full_name": "ContextualWisdomLab/fast", "owner": {{"login": "ContextualWisdomLab"}}, "archived": False, "disabled": False}},
+                {{"full_name": "ContextualWisdomLab/slow", "owner": {{"login": "ContextualWisdomLab"}}, "archived": False, "disabled": False}},
+            ]
+        if endpoint == "repos/ContextualWisdomLab/slow/pulls":
+            worker_started.set()
+            if cancellation_event is None:
+                time.sleep(5)
+            else:
+                cancellation_event.wait(5)
+            return []
+        assert worker_started.wait(1)
+        return [{{"number": 1, "updated_at": "2026-08-20T00:00:00Z"}}]
+
+generator = sweep.list_recent_pull_requests(
+    Client(),
+    organization="ContextualWisdomLab",
+    repository_source="organization",
+    since="2026-08-19T00:00:00Z",
+)
+assert next(generator)["number"] == 1
+generator.close()
+'''
+    completed = subprocess.run(
+        [sys.executable, "-c", child_program],
+        capture_output=True,
+        text=True,
+        check=False,
+        timeout=2,
+    )
+    assert completed.returncode == 0, completed.stderr
+
+
 def test_github_client_fails_closed_after_exhausting_retries(monkeypatch) -> None:
     """A persistent rate limit still fails after all retries, not silently."""
 
@@ -234,10 +327,10 @@ def test_repository_fanout_yields_fast_repository_before_slow_one() -> None:
     class FairnessClient:
         """Block one repository while allowing the next one to complete."""
 
-        def request(self, args, *, input_payload=None):
+        def request(self, args, *, input_payload=None, cancellation_event=None):
             """Return the inventory or one deliberately paced pull list."""
 
-            del input_payload
+            del input_payload, cancellation_event
             endpoint = args[0]
             if endpoint == "orgs/ContextualWisdomLab/repos":
                 return [repository("alpha"), repository("bravo")]
@@ -310,14 +403,13 @@ def test_generator_close_stops_additional_pages_after_inflight_request(
 
     sweep = sweep_module()
     page_two_started = threading.Event()
-    release_page_two = threading.Event()
     shutdown_started = threading.Event()
 
     class ClosingClient:
         """Keep the second repository in one bounded in-flight request."""
 
-        def request(self, args, *, input_payload=None):
-            """Return page one or pause page two until the closer releases it."""
+        def request(self, args, *, input_payload=None, cancellation_event=None):
+            """Return page one or pause page two until cancellation."""
             del input_payload
             endpoint = args[0]
             if endpoint == "orgs/ContextualWisdomLab/repos":
@@ -332,7 +424,8 @@ def request(self, args, *, input_payload=None):
                 return [pull(number) for number in range(100, 200)]
             if page == 2:
                 page_two_started.set()
-                assert release_page_two.wait(2)
+                assert cancellation_event is not None
+                assert cancellation_event.wait(2)
                 return [pull(number) for number in range(200, 300)]
             raise AssertionError(f"unexpected third page request: {args!r}")
 
@@ -374,7 +467,6 @@ def shutdown(self, *, wait, cancel_futures):
     closer = threading.Thread(target=generator.close)
     closer.start()
     assert shutdown_started.wait(2)
-    release_page_two.set()
     closer.join(2)
 
     assert not closer.is_alive()
diff --git a/tests/test_agent_mention_workflow_contract.py b/tests/test_agent_mention_workflow_contract.py
index c5fc4cae54..be110c6da3 100644
--- a/tests/test_agent_mention_workflow_contract.py
+++ b/tests/test_agent_mention_workflow_contract.py
@@ -60,3 +60,20 @@ def test_quality_workflow_measures_exact_files_without_module_name_warnings() ->
     assert "source =" not in coverage_config
     assert "scripts/ci/agent_mention_router.py" in coverage_config
     assert "scripts/ci/agent_mention_sweep.py" in coverage_config
+
+
+def test_quality_workflow_installs_every_full_suite_dependency_lock() -> None:
+    """The repository-wide suite installs both trusted hashed lock closures."""
+
+    text = QUALITY_WORKFLOW.read_text(encoding="utf-8")
+    header = text.split("\njobs:\n", 1)[0]
+    assert '      - "requirements-opencode-review-ci-hashes.txt"' in header
+    assert '      - "requirements-noema-document-ci-hashes.txt"' in header
+    assert "cache-dependency-path: |" in text
+    assert "requirements-opencode-review-ci-hashes.txt" in text
+    assert "requirements-noema-document-ci-hashes.txt" in text
+    install = text.split("- name: Install exact hash-locked tooling", 1)[1].split(
+        "- name:", 1
+    )[0]
+    assert "-r requirements-opencode-review-ci-hashes.txt" in install
+    assert "-r requirements-noema-document-ci-hashes.txt" in install