fix: second-audit gate findings (B1, I1-I8, M1-M10)

B1: gateway capability check now triggers on walking the sub2api
gateway, not on the gateway having filled a model; task-level
explicit models are audited (worker_capability_gateway_explicit)
but never blocked, preserving explicit priority; gateway-default
models still fail-fast under active.
I1: dry-run adds a gateway-model section, sourced only from
CLOUD_SUB2API_DEFAULT_MODEL (never queries the relay); an active
tier whose requires the gateway model fails or cannot verify
blocks, shadow only warns.
I2: shadow review gate now counts completed samples
(completed >= 20), same basis for sample_shortfall; the endpoint
attaches per-tier capability status (read-only policy load) and
flags capability-failing tiers in the recommendation.
I3: configured-but-broken routing policy logs a warning in
load_routing_policy (unconfigured stays silent); the worker sets
routing_policy_load_failed and audits
worker_routing_policy_load_failed per task.
I4: resume preamble wraps prior output/error as data with an
explicit do-not-execute constraint; position verified in run_one
(tree -> preamble -> project -> original) and the docs corrected
from the false 'closest to the original prompt' claim.
I5: decided model is written back with a CAS UPDATE
(model IS NULL OR model=''), so later attempts reuse it;
explicit models are never overwritten.
I6: agent_* columns added to worker._ensure_result_columns and
db.init_postgres_schema backfill; migrations backfills them for
tasks before insert (sender_task_id pattern); column-level tests
for agent_tool_approvals and task_attempts.
I7: coordinator requeue adds AND status=<snapshot> (rowcount 0
skips requeue/audit) and filters paused_by_user / user_cancel /
user_pause children, which are never revived or cleared.
I8: explicit-model tasks (including coordinator children that
inherited a parent model) audit a source=explicit worker_routing
row; evaluate_shadow counts it as per-tier explicit_n only,
never routed_n, never a dedup slot.
M1/M2/M3/M5/M6/M8/M10: dedup slot moved after tier validation,
shadow sort doc fixed, truncated recommendation notes truncation,
seed cleanup on gateway/quota/goal-cap early returns, tools-only
coordinator definitions rejected, preamble goal branch marked
effectively unreachable, DESIGN.md drift corrected (outside repo).
M4/M7/M9: documentation/new-field only (pass_rate_fully_measured,
whitespace-model shadow-drop note, bound-note race note); old
field semantics unchanged.

cloud/tests/test_routing_capability.py

@@ -211,6 +211,10 @@ class CapabilityDryRunTestCase(unittest.TestCase):
         self.assertTrue(any("lacks" in w for w in report["warnings"]))
 
     def test_active_capable_does_not_block(self):
+        # Audit fix 3（I1）：干跑新增网关模型检查；不传
+        # gateway_model 时 active 档 requires 无法验证即
+        # blocked。本用例的意图是“能力满足不拦”，所以
+        # 传一个同样满足的网关模型。
         report = dry_run_policy_document({
             "mode": "active",
             "tiers": {"plan": {"model": "plan-model",
@@ -218,7 +222,7 @@ class CapabilityDryRunTestCase(unittest.TestCase):
             "model_capabilities": {
                 "plan-model": {"tool_calling": True},
             },
-        })
+        }, gateway_model="plan-model")
         self.assertFalse(report["blocked"])
         self.assertEqual(
             report["tiers"]["plan"]["capabilities"]["status"], "ok")