test(campaign): prove GreenMail delivery journey

examples/greenmail-delivery/campaign.json

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+{
+  "version": "1.0",
+  "campaign": {
+    "id": "greenmail-delivery",
+    "name": "GreenMail delivery acceptance",
+    "description": "Credential-free Campaign fixture for the local SMTP/IMAP acceptance test bed.",
+    "mode": "test"
+  },
+  "fields": [
+    {
+      "name": "display_name",
+      "type": "string",
+      "label": "Display name",
+      "required": true
+    },
+    {
+      "name": "acceptance_run",
+      "type": "string",
+      "label": "Acceptance run",
+      "required": true
+    }
+  ],
+  "server": {
+    "mail_profile_id": "00000000-0000-4000-8000-000000000001"
+  },
+  "recipients": {
+    "from": [
+      {
+        "email": "campaign-test@govoplan.test",
+        "name": "GovOPlaN acceptance",
+        "type": "to"
+      }
+    ],
+    "allow_individual_to": true
+  },
+  "template": {
+    "subject": "[GovOPlaN acceptance ${acceptance_run}] Campaign delivery",
+    "text": "Hello ${display_name},\n\nThis is an isolated GovOPlaN Campaign SMTP/IMAP acceptance message.\n",
+    "body_mode": "text"
+  },
+  "attachments": {
+    "base_path": ".",
+    "send_without_attachments_behavior": "continue",
+    "global": []
+  },
+  "entries": {
+    "inline": [
+      {
+        "id": "greenmail-recipient",
+        "to": [
+          {
+            "email": "campaign-test@govoplan.test",
+            "name": "GreenMail recipient",
+            "type": "to"
+          }
+        ],
+        "fields": {
+          "display_name": "GreenMail recipient",
+          "acceptance_run": "fixture"
+        }
+      }
+    ]
+  },
+  "validation_policy": {
+    "missing_email": "block",
+    "template_error": "block"
+  },
+  "delivery": {
+    "rate_limit": {
+      "messages_per_minute": 60
+    },
+    "retry": {
+      "max_attempts": 3,
+      "backoff_seconds": [
+        1,
+        5,
+        30
+      ]
+    },
+    "imap_append_sent": {
+      "enabled": true,
+      "folder": "Sent"
+    }
+  },
+  "status_tracking": {
+    "enabled": true
+  }
+}

examples/greenmail-delivery/fixture.json

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+{
+  "scenario": "greenmail-delivery",
+  "campaign_file": "campaign.json",
+  "required_modules": [
+    "core",
+    "access",
+    "audit",
+    "campaigns",
+    "mail"
+  ],
+  "required_capabilities": [
+    "mail.campaign_delivery"
+  ],
+  "transport": "local GreenMail SMTP/IMAP test bed",
+  "credentials": "local environment only; never copied into Campaign JSON or evidence",
+  "expected": {
+    "entries_count": 1,
+    "built_count": 1,
+    "smtp_accepted_count": 1,
+    "imap_appended_count": 1
+  }
+}