feat(P25): deploy outputs (SSM + PR comment) + error reporting via Lambda + stage comments

---ci---
project: acdl
phase: 25
milestone: v1.7
status: execute
---/ci---

pipelines/deploy.yaml

@@ -48,4 +48,14 @@ stages:
   - name: apply
     description: Apply the Terraform plan (dev environment only, autonomous per §10)
     command: terraform -chdir=terraform/spike apply -auto-approve -lock=false
+    required: false
+
+  - name: publish-outputs
+    description: Publish deploy outputs to SSM Parameter Store (SecureString) + GitHub PR comment
+    command: python3 -c "from core.output_publisher import publish_to_ssm, format_comment, post_github_comment; import json,subprocess; tf=json.loads(subprocess.check_output(['terraform','-chdir=terraform/spike','output','-json']) or '{}'); outputs={k:v.get('value') if isinstance(v,dict) else v for k,v in tf.items()}; ssm=publish_to_ssm(outputs,'dev','spike'); comment=format_comment(outputs,'dev','spike',ssm); post_github_comment(comment)"
+    required: false
+
+  - name: comment-outputs
+    description: Post a structured GitHub PR comment with human-readable deploy outputs
+    command: bash scripts/post_stage_comment.sh publish-outputs pass
     required: false