diff --git a/.custodian-brief.md b/.custodian-brief.md
index d8ed0fd..d7301eb 100644
--- a/.custodian-brief.md
+++ b/.custodian-brief.md
@@ -2,13 +2,13 @@
 # Custodian Brief — glas-harness
 
 **Domain:** infotech  
-**Last synced:** 2026-09-05 17:22 UTC  
+**Last synced:** 2026-09-05 17:34 UTC  
 **State Hub:** http://127.0.0.1:8000 *(adjust if running on a remote machine)*
 
 ## Active Workstreams
 
 ### Prove the first local rein profile end to end
-Progress: 1/5 done  |  workplan_id: `170bf1ae-337f-5553-8d1e-03b07100e08f`
+Progress: 2/6 done  |  workplan_id: `170bf1ae-337f-5553-8d1e-03b07100e08f`
 
 **Open tasks:**
 - ! Resolve and verify the owner runtime, credential, and egress contract  `4209f564`
diff --git a/WORK-RECORDS.md b/WORK-RECORDS.md
index 085a7d9..351aa22 100644
--- a/WORK-RECORDS.md
+++ b/WORK-RECORDS.md
@@ -66,6 +66,7 @@
 | task | GLAS-WP-0012-T03 | wait | — | workplans/GLAS-WP-0012-first-local-profile-production-proof.md |
 | task | GLAS-WP-0012-T04 | wait | — | workplans/GLAS-WP-0012-first-local-profile-production-proof.md |
 | task | GLAS-WP-0012-T05 | wait | — | workplans/GLAS-WP-0012-first-local-profile-production-proof.md |
+| task | GLAS-WP-0012-T06 | done | — | workplans/GLAS-WP-0012-first-local-profile-production-proof.md |
 | intake | GLAS-IN-0001 | done | blue | docs/intakes/residuals.md |
 | intake | GLAS-IN-0002 | todo | red | docs/intakes/residuals.md |
 | intake | GLAS-IN-0003 | todo | green | docs/intakes/residuals.md |
diff --git a/docs/local-profile-acceptance.md b/docs/local-profile-acceptance.md
index f13bdc4..72a8882 100644
--- a/docs/local-profile-acceptance.md
+++ b/docs/local-profile-acceptance.md
@@ -123,3 +123,39 @@ retarget existing consumers or enable production schedules.
 
 The open-weight profile remains blocked until its own route and real-rein
 proof pass. Keep that portion of `GLAS-IN-0002` live after this workplan closes.
+
+## Prepared acceptance runner
+
+After the owner requirements and candidate review pass, run:
+
+```bash
+.venv/bin/python scripts/prove-local-profile.py \
+  --harness-profile harness.agent-dev-local@1.1.0
+```
+
+Use `--profile-dir <reviewed-directory>` if the versioned candidate is staged
+outside the packaged catalog. The runner requires an explicit version, the
+local Claude route, nonempty credential route references, and bounded token/time
+limits. It preserves catalog readiness and refuses blocked profiles before
+creating even the disposable fixture. There is no force or readiness override.
+
+The fixture wraps the catalog-built `ReinAharness` to observe its result and
+cleanup, while delegating actual session setup and agent dispatch. It checks
+the committed and working-tree file contents, direct parent commit, changed
+paths, clean tree (including ignored files), source absence, exact child
+identity, and task mode inside owner execution. Task removal is checked before
+destroy; host source integrity and workspace absence are checked afterward.
+
+Output includes configuration references, requested model, commit id, and
+boolean checks. It excludes raw model/provider output, task text, and exception
+messages. Exit zero means this real-run artifact/lifecycle acceptance passed;
+`readiness_review_required` remains true. The owner runtime/deployment pins,
+credential-delivery proof, enforced egress and negative-route checks remain
+separate prerequisites for T02/T05. The runner does not update the catalog or
+publish artifacts.
+
+Validation of the runner itself: its focused tests use local disposable Git
+repositories and mocked adapter boundaries, covering extra commits, extra
+paths, bad content, untracked/ignored artifacts, source visibility, file mode,
+strict boolean inspection results, redacted failures, and profile refusal.
+These tests do not count as the pending real-rein acceptance run.
diff --git a/scripts/prove-local-profile.py b/scripts/prove-local-profile.py
new file mode 100644
index 0000000..ff2173e
--- /dev/null
+++ b/scripts/prove-local-profile.py
@@ -0,0 +1,212 @@
+"""Real-rein acceptance fixture for GLAS-WP-0012; never overrides readiness."""
+
+import argparse
+import json
+import subprocess
+import tempfile
+from pathlib import Path
+
+from sandboxer.core.manager import SandboxManager
+from sandboxer.lifecycle.store import SandboxStore
+from sandboxer.payments.credits import CreditsStore
+from sandboxer.snapshots.store import SnapshotStore
+
+from glas_harness.contract import ExecutionRequest, Rein
+from glas_harness.gateway import run_execution
+from glas_harness.profiles import ProfileCatalog
+from glas_harness.reins.rein_aharness import ReinAharness
+
+
+# Executed inside the sandbox; results contain only booleans and a Git object id.
+INSPECTOR = r'''
+import json, os, stat, subprocess, sys
+from pathlib import Path
+baseline, source, task, request_id = sys.argv[1:]
+def git(*args):
+    return subprocess.check_output(['git', *args], stderr=subprocess.DEVNULL,
+                                   timeout=10)
+head = git('rev-parse', 'HEAD').decode().strip()
+artifact = Path('PROOF.md')
+expected = b'Glas local profile proof.\n'
+checks = {
+    'one_commit': git('rev-list', '--parents', '-n', '1', 'HEAD').decode().split()
+                  == [head, baseline],
+    'only_expected_path': git('diff-tree', '--no-commit-id', '--name-only', '-r',
+                              '-z', 'HEAD') == b'PROOF.md\x00',
+    'clean_worktree': not git('status', '--porcelain', '--untracked-files=all',
+                              '--ignored=matching').strip(),
+    'regular_artifact': artifact.is_file() and not artifact.is_symlink(),
+    'worktree_content': artifact.is_file() and artifact.read_bytes() == expected,
+    'committed_content': git('show', 'HEAD:PROOF.md') == expected,
+    'source_absent': not Path(source).exists(),
+    'task_private': stat.S_IMODE(Path(task).stat().st_mode) == 0o600,
+    'identity_exact': os.environ.get('SANDBOXER_ACTOR') == 'agt'
+                      and os.environ.get('SANDBOXER_PROJECT') == 'glas-local-proof'
+                      and os.environ.get('SANDBOXER_RUN_ID') == request_id,
+}
+print(json.dumps({'head': head, 'checks': checks}))
+'''
+
+CHECKS = {
+    "one_commit", "only_expected_path", "clean_worktree", "regular_artifact",
+    "worktree_content", "committed_content", "source_absent", "task_private",
+    "identity_exact",
+}
+
+
+class ObservedRein(Rein):
+    """Observe the catalog-built adapter without replacing its agent dispatch."""
+
+    def __init__(self, delegate, source):
+        self.delegate = delegate
+        self.source = source
+        self.workspace = None
+        self.request_id = None
+        self.checks = {}
+        self.task_removed = False
+
+    def start_session(self, profile, inputs, sandbox):
+        reachability = sandbox.reachability
+        if not reachability.get("workspace_dir") or reachability.get("ssh"):
+            raise RuntimeError("local proof requires an owner-managed local workspace")
+        self.workspace = reachability["workspace_dir"]
+        self.request_id = inputs["request_id"]
+        return self.delegate.start_session(profile, inputs, sandbox)
+
+    def dispatch_tool(self, session, tool_call):
+        return self.delegate.dispatch_tool(session, tool_call)
+
+    def end_session(self, session):
+        summary = self.delegate.end_session(session)
+        if summary.outcome != "succeeded":
+            return summary
+        result = session["transport"].run(
+            ["/usr/bin/python3", "-c", INSPECTOR, session["head_before"],
+             str(self.source), session["task_file"], self.request_id], timeout=30,
+        )
+        if result.returncode:
+            raise RuntimeError("sandbox artifact inspection failed")
+        try:
+            report = json.loads(result.stdout)
+            checks = report["checks"]
+            self.checks = {key: checks.get(key) is True for key in CHECKS}
+            self.checks["head_matches_summary"] = report["head"] == summary.commit_sha
+        except (ValueError, KeyError, TypeError, AttributeError) as exc:
+            raise RuntimeError("invalid sandbox artifact inspection") from exc
+        if not all(self.checks.values()):
+            raise RuntimeError("sandbox artifact acceptance failed")
+        return summary
+
+    def cleanup_session(self, session):
+        self.delegate.cleanup_session(session)
+        proc = session["transport"].run(
+            ["test", "!", "-e", session["task_file"]], timeout=15
+        )
+        self.task_removed = proc.returncode == 0
+        if not self.task_removed:
+            raise RuntimeError("generated task file survived cleanup")
+
+
+def select_candidate(reference, catalog):
+    if "@" not in reference:
+        raise ValueError("proof requires an exact version-pinned profile")
+    profile, descriptor = catalog.resolve(reference)
+    catalog.require_operational(profile)
+    if (profile.id != "harness.agent-dev-local" or descriptor.id != "rein-aharness"
+            or profile.model.route != "claude-code-cli"
+            or profile.model.provider != "anthropic"):
+        raise ValueError("proof requires the reviewed local Claude route")
+    if not profile.credential_route_refs:
+        raise ValueError("proof requires declared credential route references")
+    if (not profile.limits.timeout_seconds or profile.limits.timeout_seconds > 900
+            or not profile.limits.budget_tokens or profile.limits.budget_tokens > 60000):
+        raise ValueError("proof requires explicit bounded token and time limits")
+    delegate = catalog.build_rein(profile, descriptor)
+    if type(delegate) is not ReinAharness:
+        raise ValueError("proof requires the actual ReinAharness adapter")
+    return profile, delegate
+
+
+def git(source, *args):
+    return subprocess.check_output(["git", *args], cwd=source,
+                                   stderr=subprocess.DEVNULL, timeout=15)
+
+
+def prove(reference, catalog):
+    # This gate precedes even the disposable fixture and sandbox manager.
+    profile, delegate = select_candidate(reference, catalog)
+    with tempfile.TemporaryDirectory(prefix="glas-real-rein-proof-") as directory:
+        root = Path(directory)
+        source = root / "source"
+        source.mkdir()
+        git(source, "init", "-q")
+        git(source, "config", "user.name", "Glas Acceptance")
+        git(source, "config", "user.email", "proof@example.invalid")
+        (source / "sentinel").write_bytes(b"unchanged\n")
+        git(source, "add", "sentinel")
+        git(source, "commit", "-qm", "fixture")
+        source_head = git(source, "rev-parse", "HEAD")
+        manager = SandboxManager(
+            store=SandboxStore(path=root / "sandboxes.json"),
+            credits=CreditsStore(path=root / "credits.json"),
+            snapshots=SnapshotStore(path=root / "snapshots.json"),
+        )
+        observed = ObservedRein(delegate, source)
+        result = run_execution(ExecutionRequest(
+            harness_profile_ref=reference, repo=str(source), title="local profile proof",
+            description=("Create only PROOF.md containing exactly 'Glas local profile proof.' "
+                         "followed by one newline. Make exactly one local commit. "
+                         "Leave the working tree clean. Do not push or change other files."),
+            actor="agt", project="glas-local-proof", report_to_hub=False,
+        ), catalog=catalog, rein=observed, manager=manager)
+        source_unchanged = (
+            (source / "sentinel").read_bytes() == b"unchanged\n"
+            and git(source, "rev-parse", "HEAD") == source_head
+            and not git(source, "status", "--porcelain", "--untracked-files=all",
+                        "--ignored=matching").strip()
+        )
+        status = manager.store.get(result.evidence.sandbox_id) if result.evidence.sandbox_id else None
+        destroyed = status is not None and status.state.value == "destroyed"
+        workspace_removed = bool(observed.workspace) and not Path(observed.workspace).exists()
+        passed = (result.ok and bool(observed.checks) and all(observed.checks.values())
+                  and observed.task_removed and source_unchanged and destroyed
+                  and workspace_removed)
+        # Do not print tool_output, tool_error, exceptions, prompts, or raw owner stdout.
+        return {
+            "acceptance_passed": passed, "profile_ref": reference,
+            "profile_readiness": profile.operational_readiness.status,
+            "sandbox_profile": profile.sandbox_profile,
+            "requested_model": profile.model.model,
+            "model_route": profile.model.route,
+            "credential_route_refs": profile.credential_route_refs,
+            "limits": profile.limits.model_dump(exclude_none=True),
+            "request_id": result.evidence.request_id,
+            "sandbox_id": result.evidence.sandbox_id,
+            "commit_sha": result.evidence.commit_sha,
+            "outcome": result.evidence.outcome,
+            "failure_stage": result.evidence.failure_stage,
+            "artifact_checks": observed.checks,
+            "source_unchanged": source_unchanged,
+            "task_removed_before_teardown": observed.task_removed,
+            "destroyed": destroyed, "workspace_removed": workspace_removed,
+            "readiness_review_required": True,
+        }
+
+
+def main(argv=None):
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--harness-profile", required=True)
+    parser.add_argument("--profile-dir", type=Path)
+    args = parser.parse_args(argv)
+    try:
+        report = prove(args.harness_profile, ProfileCatalog(profile_dir=args.profile_dir))
+    except Exception as exc:
+        # Configuration/provider errors can contain secret values; expose only the type.
+        report = {"acceptance_passed": False, "error_type": type(exc).__name__,
+                  "readiness_review_required": True}
+    print(json.dumps(report, indent=2))
+    return 0 if report["acceptance_passed"] else 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/test_local_profile_proof.py b/tests/test_local_profile_proof.py
new file mode 100644
index 0000000..96f9a14
--- /dev/null
+++ b/tests/test_local_profile_proof.py
@@ -0,0 +1,172 @@
+import importlib.util
+import json
+import subprocess
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from glas_harness.contract import ExecutionSummary, OperationalReadiness, ToolCall
+from glas_harness.profiles import OperationallyBlockedProfileError, ProfileCatalog
+from glas_harness.reins.rein_aharness import ReinAharness
+
+
+spec = importlib.util.spec_from_file_location(
+    "local_profile_proof", Path(__file__).parents[1] / "scripts/prove-local-profile.py"
+)
+proof = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(proof)
+
+
+def test_blocked_profile_refuses_before_fixture_or_manager_creation():
+    with patch.object(proof.tempfile, "TemporaryDirectory") as temporary, \
+            patch.object(proof, "SandboxManager") as manager:
+        with pytest.raises(OperationallyBlockedProfileError):
+            proof.prove("harness.agent-dev-local@1.0.0", ProfileCatalog())
+    temporary.assert_not_called()
+    manager.assert_not_called()
+
+
+def test_unpinned_profile_is_never_a_proof_candidate():
+    with pytest.raises(ValueError, match="version-pinned"):
+        proof.select_candidate("harness.agent-dev-local", ProfileCatalog())
+
+
+@pytest.mark.parametrize("changes", [
+    {"credential_route_refs": []},
+    {"timeout_seconds": 901},
+    {"timeout_seconds": None},
+    {"budget_tokens": 60001},
+    {"budget_tokens": None},
+])
+def test_candidate_requires_credentials_and_explicit_proof_bounds(changes):
+    catalog = ProfileCatalog()
+    profile, _ = catalog.resolve("harness.agent-dev-local@1.0.0")
+    updates = {
+        "operational_readiness": OperationalReadiness(status="unverified"),
+        "credential_route_refs": ["test-claude-route"],
+        "limits": profile.limits.model_copy(update={
+            key: value for key, value in changes.items() if key != "credential_route_refs"
+        }),
+    }
+    if "credential_route_refs" in changes:
+        updates["credential_route_refs"] = changes["credential_route_refs"]
+    catalog.profiles()[(profile.id, profile.version)] = profile.model_copy(update=updates)
+    with pytest.raises(ValueError):
+        proof.select_candidate(str(profile.ref), catalog)
+
+
+def test_observer_delegates_actual_dispatch_and_cleanup():
+    delegate = MagicMock(spec=ReinAharness)
+    observer = proof.ObservedRein(delegate, Path("/absent-source"))
+    session = {"transport": MagicMock(), "task_file": "/workspace/.git/task.json"}
+    call = ToolCall(name="run_task")
+    assert observer.dispatch_tool(session, call) is delegate.dispatch_tool.return_value
+    delegate.dispatch_tool.assert_called_once_with(session, call)
+    session["transport"].run.return_value.returncode = 0
+    observer.cleanup_session(session)
+    delegate.cleanup_session.assert_called_once_with(session)
+    session["transport"].run.assert_called_once_with(
+        ["test", "!", "-e", session["task_file"]], timeout=15
+    )
+    assert observer.task_removed
+
+
+@pytest.mark.parametrize("report", [
+    {"head": "abc", "checks": {}},
+    {"head": "wrong", "checks": {key: True for key in proof.CHECKS}},
+    {"head": "abc", "checks": {key: "true" for key in proof.CHECKS}},
+])
+def test_observer_rejects_incomplete_mismatched_or_untyped_inspection(report):
+    delegate = MagicMock(spec=ReinAharness)
+    delegate.end_session.return_value = ExecutionSummary(
+        committed=True, outcome="succeeded", commit_sha="abc"
+    )
+    observer = proof.ObservedRein(delegate, Path("/absent-source"))
+    observer.request_id = "proof-request"
+    transport = MagicMock()
+    transport.run.return_value = subprocess.CompletedProcess([], 0, json.dumps(report), "")
+    with pytest.raises(RuntimeError, match="acceptance failed"):
+        observer.end_session({"transport": transport, "head_before": "before",
+                              "task_file": "/workspace/.git/task.json"})
+
+
+@pytest.fixture
+def repository(tmp_path):
+    repo = tmp_path / "sandbox"
+    repo.mkdir()
+    proof.git(repo, "init", "-q")
+    proof.git(repo, "config", "user.name", "Glas Proof Tests")
+    proof.git(repo, "config", "user.email", "proof@example.invalid")
+    (repo / "sentinel").write_text("unchanged\n")
+    proof.git(repo, "add", "sentinel")
+    proof.git(repo, "commit", "-qm", "baseline")
+    baseline = proof.git(repo, "rev-parse", "HEAD").decode().strip()
+    task = repo / ".git/task.json"
+    task.write_text("{}")
+    task.chmod(0o600)
+    (repo / "PROOF.md").write_text("Glas local profile proof.\n")
+    proof.git(repo, "add", "PROOF.md")
+    proof.git(repo, "commit", "-qm", "proof")
+    return repo, baseline, task
+
+
+def inspect(repository, source):
+    repo, baseline, task = repository
+    result = subprocess.run(
+        ["/usr/bin/python3", "-c", proof.INSPECTOR, baseline, str(source), str(task), "req"],
+        cwd=repo, capture_output=True, text=True, timeout=15,
+        env={"PATH": "/usr/bin:/bin", "HOME": str(repo),
+             "SANDBOXER_ACTOR": "agt", "SANDBOXER_PROJECT": "glas-local-proof",
+             "SANDBOXER_RUN_ID": "req"},
+    )
+    assert result.returncode == 0, result.stderr
+    return json.loads(result.stdout)
+
+
+def test_artifact_inspector_validates_content_and_parent_commit(repository, tmp_path):
+    report = inspect(repository, tmp_path / "absent-source")
+    assert set(report["checks"]) == proof.CHECKS
+    assert all(report["checks"].values())
+
+
+@pytest.mark.parametrize("fault,failed_check", [
+    ("extra_commit", "one_commit"),
+    ("wrong_content", "committed_content"),
+    ("extra_path", "only_expected_path"),
+    ("untracked", "clean_worktree"),
+    ("ignored", "clean_worktree"),
+    ("source_visible", "source_absent"),
+    ("task_mode", "task_private"),
+])
+def test_artifact_inspector_rejects_false_positive_commits(repository, tmp_path,
+                                                        fault, failed_check):
+    repo, _, task = repository
+    source = tmp_path / "absent-source"
+    if fault == "extra_commit":
+        proof.git(repo, "commit", "--allow-empty", "-qm", "extra")
+    elif fault == "wrong_content":
+        (repo / "PROOF.md").write_text("wrong\n")
+        proof.git(repo, "commit", "-qam", "wrong", "--amend")
+    elif fault == "extra_path":
+        (repo / "extra").write_text("unwanted\n")
+        proof.git(repo, "add", "extra")
+        proof.git(repo, "commit", "-qm", "extra path", "--amend")
+    elif fault in {"untracked", "ignored"}:
+        (repo / "private-cache").write_text("must not survive\n")
+        if fault == "ignored":
+            (repo / ".git/info/exclude").write_text("private-cache\n")
+    elif fault == "source_visible":
+        source.mkdir()
+    elif fault == "task_mode":
+        task.chmod(0o644)
+    report = inspect(repository, source)
+    assert report["checks"][failed_check] is False
+
+
+def test_cli_never_prints_raw_provider_errors(capsys):
+    with patch.object(proof, "prove", side_effect=RuntimeError("secret-provider-response")):
+        assert proof.main(["--harness-profile", "harness.agent-dev-local@1.0.0"]) == 1
+    output = capsys.readouterr().out
+    assert "secret-provider-response" not in output
+    assert json.loads(output)["error_type"] == "RuntimeError"
diff --git a/workplans/GLAS-WP-0012-first-local-profile-production-proof.md b/workplans/GLAS-WP-0012-first-local-profile-production-proof.md
index 3b398ef..2fe9582 100644
--- a/workplans/GLAS-WP-0012-first-local-profile-production-proof.md
+++ b/workplans/GLAS-WP-0012-first-local-profile-production-proof.md
@@ -152,6 +152,34 @@ portion live, or split that remaining work into a separately registered record
 before closing the intake. Synchronize work records and log progress. Finish
 this workplan only when the first profile is proven and residuals remain live.
 
+## Prepare the real-rein acceptance runner
+
+```task
+id: GLAS-WP-0012-T06
+status: done
+priority: high
+state_hub_task_id: "d0c26709-549f-540a-8250-1fd1b2e4960a"
+```
+
+Independent preparation for T04 while T02 remains blocked. Add a disposable
+fixture that delegates actual dispatch to the catalog-built ReinAharness,
+validates the commit and artifact through owner execution before teardown,
+checks the host source and cleanup, and emits bounded evidence without model
+output or credential values. Refuse blocked or unpinned profiles before
+creating a sandbox. Test negative artifact cases and the refusal path. This
+runner does not itself satisfy T04 or change readiness.
+
+Completed 2026-09-05. `scripts/prove-local-profile.py` delegates real dispatch
+and observes content/commit acceptance before teardown. It verifies exactly one
+new commit, expected paths and committed/worktree content, a clean tree,
+source absence, exact child identity, private task mode/removal, and host-source
+integrity plus workspace destruction. It emits bounded evidence and has no
+readiness override. `tests/test_local_profile_proof.py`: 20 focused tests pass;
+full suite: 101 passed; catalog validation passes. A real CLI invocation against
+`harness.agent-dev-local@1.0.0` returned `OperationallyBlockedProfileError`
+without creating a sandbox. T02–T05 remain waiting on the owner dependencies;
+no real model run or readiness promotion is claimed.
+
 ## Acceptance
 
 One version-pinned local profile runs its actual rein/model task entirely in