feat(ai): verify RAG and Nemotron runtime canaries

.env.example

@@ -407,8 +407,12 @@ RAG_DEFAULT_TOP_K=5
 RAG_EMBED_MODEL=bge-m3:latest
 RAG_EMBED_DIM=1024
 RAG_EMBED_NORMALIZE=true
+RAG_EMBED_EXPECTED_DIGEST=7907646426070047a77226ac3e684fbbe8410524f7b4a74d02837e43f2146bab
+EMBED_CONSISTENCY_TIMEOUT_SEC=150
+EMBED_MODEL_IDENTITY_TIMEOUT_SEC=10
 EMBED_CONSISTENCY_INCLUDE_111=false
 INTERNAL_RAG_CANDIDATE_CANARY_THRESHOLD=0.70
+INTERNAL_RAG_CANDIDATE_CANARY_MIN_GCP_HOSTS=1
 INTERNAL_RAG_CANDIDATE_CANARY_SCHEDULED_ENABLED=true
 PPT_VISION_ENABLED=true
 PPT_VISION_MODEL=minicpm-v:latest
@@ -475,6 +479,11 @@ OPENCLAW_IMAGE_GEMINI_MODEL=gemini-1.5-flash
 NEMOTRON_OLLAMA_FIRST=true
 NEMOTRON_OLLAMA_MODEL=qwen3:14b
 NEMOTRON_OLLAMA_TIMEOUT=180
+NEMOTRON_OLLAMA_EXPECTED_DIGEST=bdbd181c33f2ed1b31c972991882db3cf4d192569092138a7d29e973cd9debe8
+NEMOTRON_DECISION_CANARY_TIMEOUT_SEC=300
+NEMOTRON_MODEL_IDENTITY_TIMEOUT_SEC=10
+NEMOTRON_DECISION_CANARY_MAX_AGE_HOURS=26
+NEMOTRON_DECISION_CANARY_SCHEDULED_ENABLED=true
 OPENCLAW_STRATEGY_OLLAMA_MODEL=qwen3:14b
 OPENCLAW_STRATEGY_OLLAMA_TIMEOUT=90
 OPENCLAW_STRATEGY_OLLAMA_NUM_PREDICT=2048
@@ -687,6 +696,7 @@ PIXELRAG_MARKETPLACE_ADAPTER_DRY_RUN_RECEIPT_ROOT=/app/data/pixelrag/receipts/ad
 PIXELRAG_MARKETPLACE_ADAPTER_PREFLIGHT_RECEIPT_ROOT=/app/data/pixelrag/receipts/adapter_preflight
 PIXELRAG_MARKETPLACE_CANDIDATE_KNOWLEDGE_REPLAY_RECEIPT_ROOT=/app/data/pixelrag/receipts/knowledge_replay
 INTERNAL_RAG_CANDIDATE_CANARY_RECEIPT_ROOT=/app/data/pixelrag/receipts/internal_rag_canary
+NEMOTRON_DECISION_CANARY_RECEIPT_ROOT=/app/data/ai_automation/nemotron_decision_canary_receipts
 PIXELRAG_MARKETPLACE_EMBEDDING_SIGNATURE_GUARD_REPLAY_RECEIPT_ROOT=/app/data/pixelrag/receipts/embedding_guard
 PIXELRAG_MARKETPLACE_IDENTITY_MATCHER_REPLAY_RECEIPT_ROOT=/app/data/pixelrag/receipts/identity_matcher
 PIXELRAG_MARKETPLACE_PROMOTION_GATE_REPLAY_RECEIPT_ROOT=/app/data/pixelrag/receipts/promotion_gate