feat(governance): 新增 Redis dry-run gate

apps/api/src/api/v1/agents.py

@@ -70,6 +70,9 @@ from src.services.ai_agent_live_read_model_gate import (
 from src.services.ai_agent_proactive_operations_contract import (
     load_latest_ai_agent_proactive_operations_contract,
 )
+from src.services.ai_agent_redis_dry_run_gate import (
+    load_latest_ai_agent_redis_dry_run_gate,
+)
 from src.services.ai_agent_telegram_action_required_digest_policy import (
     load_latest_ai_agent_telegram_action_required_digest_policy,
 )
@@ -632,6 +635,33 @@ async def get_agent_live_read_model_gate() -> dict[str, Any]:
         ) from exc
 
 
+@router.get(
+    "/agent-redis-dry-run-gate",
+    response_model=dict[str, Any],
+    summary="取得 AI Agent Redis dry-run gate",
+    description=(
+        "讀取最新已提交的 Redis Streams consumer group dry-run、handoff envelope、"
+        "ack / dead-letter / replay gate；此端點不連 Redis、不建立 consumer group、不 XADD、"
+        "不 XREADGROUP、不 ACK、不寫 dead-letter、不 replay、不送 Telegram、不做 learning writeback。"
+    ),
+)
+async def get_agent_redis_dry_run_gate() -> dict[str, Any]:
+    """Return the latest read-only AI Agent Redis dry-run gate snapshot."""
+    try:
+        return await asyncio.to_thread(load_latest_ai_agent_redis_dry_run_gate)
+    except FileNotFoundError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=str(exc),
+        ) from exc
+    except (json.JSONDecodeError, ValueError) as exc:
+        logger.error("ai_agent_redis_dry_run_gate_invalid", error=str(exc))
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail="AI Agent Redis dry-run gate 無效",
+        ) from exc
+
+
 @router.get(
     "/agent-proactive-operations-contract",
     response_model=dict[str, Any],

apps/api/src/services/ai_agent_redis_dry_run_gate.py

@@ -0,0 +1,183 @@
+"""
+AI Agent Redis dry-run gate snapshot.
+
+Loads the latest committed, read-only P2-403C gate for Redis Streams
+consumer group dry-run, handoff envelopes, ack/dead-letter decisions, and
+replay idempotency. This module never connects to Redis, creates consumer
+groups, writes queues, sends Telegram messages, or performs learning writeback.
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+from src.services.snapshot_paths import default_evaluations_dir
+
+_DEFAULT_EVALUATIONS_DIR = default_evaluations_dir(Path(__file__))
+_SNAPSHOT_PATTERN = "ai_agent_redis_dry_run_gate_*.json"
+_SCHEMA_VERSION = "ai_agent_redis_dry_run_gate_v1"
+
+
+def load_latest_ai_agent_redis_dry_run_gate(
+    evaluations_dir: Path | None = None,
+) -> dict[str, Any]:
+    """Load the newest committed AI Agent Redis dry-run gate snapshot."""
+    directory = evaluations_dir or _DEFAULT_EVALUATIONS_DIR
+    candidates = sorted(directory.glob(_SNAPSHOT_PATTERN))
+    if not candidates:
+        raise FileNotFoundError(
+            f"no AI Agent Redis dry-run gate snapshots found in {directory}"
+        )
+
+    latest = candidates[-1]
+    with latest.open(encoding="utf-8") as handle:
+        payload = json.load(handle)
+
+    if not isinstance(payload, dict):
+        raise ValueError(f"{latest}: expected JSON object")
+    _require_schema(payload, str(latest))
+    _require_read_only_boundaries(payload, str(latest))
+    _require_fixture_contract(payload, str(latest))
+    _require_handoff_safety(payload, str(latest))
+    _require_rollup_consistency(payload, str(latest))
+    return payload
+
+
+def _require_schema(payload: dict[str, Any], label: str) -> None:
+    actual = payload.get("schema_version")
+    if actual != _SCHEMA_VERSION:
+        raise ValueError(f"{label}: expected schema_version={_SCHEMA_VERSION}, got {actual!r}")
+    status = payload.get("program_status") or {}
+    if status.get("read_only_mode") is not True:
+        raise ValueError(f"{label}: program_status.read_only_mode must be true")
+    if status.get("runtime_authority") != "dry_run_contract_only_no_redis_runtime":
+        raise ValueError(f"{label}: runtime_authority must stay dry_run_contract_only_no_redis_runtime")
+
+
+def _require_read_only_boundaries(payload: dict[str, Any], label: str) -> None:
+    boundaries = payload.get("approval_boundaries") or {}
+    enabled = sorted(key for key, value in boundaries.items() if value is not False)
+    if enabled:
+        raise ValueError(f"{label}: approval boundaries must remain false: {enabled}")
+
+    truth = payload.get("dry_run_truth") or {}
+    false_flags = {
+        "redis_connection_allowed",
+        "consumer_group_created",
+        "xadd_allowed",
+        "xreadgroup_allowed",
+        "ack_allowed",
+        "dead_letter_write_allowed",
+        "replay_runtime_allowed",
+        "telegram_send_allowed",
+        "learning_writeback_allowed",
+    }
+    unsafe = sorted(flag for flag in false_flags if truth.get(flag) is not False)
+    if unsafe:
+        raise ValueError(f"{label}: dry-run truth flags must remain false: {unsafe}")
+
+    zero_counts = {
+        "live_dry_run_event_count",
+        "live_ack_count",
+        "live_dead_letter_count",
+        "live_replay_count",
+    }
+    non_zero = sorted(key for key in zero_counts if truth.get(key) != 0)
+    if non_zero:
+        raise ValueError(f"{label}: live dry-run counts must remain zero: {non_zero}")
+
+
+def _require_fixture_contract(payload: dict[str, Any], label: str) -> None:
+    contract = payload.get("consumer_group_dry_run_contract") or {}
+    if contract.get("fixture_only") is not True:
+        raise ValueError(f"{label}: dry-run contract must stay fixture_only")
+    if contract.get("redis_network_call_allowed") is not False:
+        raise ValueError(f"{label}: Redis network calls must remain blocked")
+    if not contract.get("required_fixture_fields"):
+        raise ValueError(f"{label}: required_fixture_fields must not be empty")
+
+
+def _require_handoff_safety(payload: dict[str, Any], label: str) -> None:
+    envelope = payload.get("handoff_envelope_contract") or {}
+    required_fields = set(envelope.get("required_fields") or [])
+    required_minimum = {
+        "event_id",
+        "trace_id",
+        "session_id",
+        "incident_id",
+        "from_agent",
+        "to_agent",
+        "handoff_type",
+        "redacted_evidence_ref",
+        "idempotency_key",
+    }
+    missing = sorted(required_minimum - required_fields)
+    if missing:
+        raise ValueError(f"{label}: handoff envelope missing required fields: {missing}")
+    if envelope.get("redacted_evidence_required") is not True:
+        raise ValueError(f"{label}: redacted evidence refs must be required")
+    if envelope.get("idempotency_key_required") is not True:
+        raise ValueError(f"{label}: idempotency key must be required")
+
+    ack_contract = payload.get("ack_dead_letter_replay_contract") or {}
+    for flag in ("ack_requires_verifier", "dead_letter_requires_reason", "replay_requires_idempotency"):
+        if ack_contract.get(flag) is not True:
+            raise ValueError(f"{label}: {flag} must be true")
+    if ack_contract.get("runtime_replay_allowed") is not False:
+        raise ValueError(f"{label}: runtime replay must remain blocked")
+
+    redaction = payload.get("display_redaction_contract") or {}
+    if redaction.get("redaction_required") is not True:
+        raise ValueError(f"{label}: frontend redaction must be required")
+    for flag in ("raw_payload_display_allowed", "private_reasoning_display_allowed", "secret_value_display_allowed"):
+        if redaction.get(flag) is not False:
+            raise ValueError(f"{label}: {flag} must remain false")
+
+
+def _require_rollup_consistency(payload: dict[str, Any], label: str) -> None:
+    rollups = payload.get("rollups") or {}
+    steps = payload.get("dry_run_steps") or []
+    lanes = payload.get("handoff_lanes") or []
+    envelope = payload.get("handoff_envelope_contract") or {}
+    truth = payload.get("dry_run_truth") or {}
+    expected_counts = {
+        "source_ref_count": len(payload.get("source_refs") or []),
+        "dry_run_step_count": len(steps),
+        "handoff_lane_count": len(lanes),
+        "blocked_runtime_action_count": len({step.get("blocked_runtime_action") for step in steps}),
+        "required_handoff_field_count": len(envelope.get("required_fields") or []),
+        "forbidden_field_count": len(envelope.get("forbidden_fields") or []),
+    }
+    mismatched = {
+        key: {"expected": expected, "actual": rollups.get(key)}
+        for key, expected in expected_counts.items()
+        if rollups.get(key) != expected
+    }
+    if mismatched:
+        raise ValueError(f"{label}: rollup counts must match payload sections: {mismatched}")
+
+    contract_ready = sorted(
+        step.get("step_id") for step in steps if step.get("status") == "contract_ready"
+    )
+    if sorted(rollups.get("contract_ready_step_ids") or []) != contract_ready:
+        raise ValueError(f"{label}: rollups.contract_ready_step_ids mismatch")
+
+    approval_required = sorted(
+        step.get("step_id") for step in steps if step.get("status") == "approval_required"
+    )
+    if sorted(rollups.get("approval_required_step_ids") or []) != approval_required:
+        raise ValueError(f"{label}: rollups.approval_required_step_ids mismatch")
+
+    live_total = sum(
+        int(truth.get(key) or 0)
+        for key in (
+            "live_dry_run_event_count",
+            "live_ack_count",
+            "live_dead_letter_count",
+            "live_replay_count",
+        )
+    )
+    if rollups.get("live_truth_count_total") != live_total:
+        raise ValueError(f"{label}: rollups.live_truth_count_total mismatch")