feat(ack): bind test env to deployer and add regression mode

ACK 0.19.0 hands test-environment deploys to the deployer skill,
documents bug-fix as a first-class scenario, and adds
docs/ack/regression.yaml harvest plus a /ack regression run.

skills/ack/templates/tasks.schema.json

@@ -69,6 +69,11 @@
           "const": "docs/ack/delivery.yaml",
           "description": "可选项目交付契约的唯一权威路径"
         },
+        "regressionFile": {
+          "type": "string",
+          "const": "docs/ack/regression.yaml",
+          "description": "可选项目回归目录的唯一权威路径"
+        },
         "bugIntake": {
           "$ref": "#/definitions/feishuBugIntake"
         },
@@ -122,6 +127,12 @@
         "$ref": "#/definitions/deliveryRun"
       }
     },
+    "regressionRuns": {
+      "type": "array",
+      "items": {
+        "$ref": "#/definitions/regressionRun"
+      }
+    },
     "tasks": {
       "type": "array",
       "items": {
@@ -243,6 +254,32 @@
           "deliveryRuns": {}
         }
       }
+    },
+    {
+      "if": {
+        "properties": {
+          "project": {
+            "type": "object",
+            "required": [
+              "regressionFile"
+            ],
+            "properties": {
+              "regressionFile": {}
+            }
+          }
+        },
+        "required": [
+          "project"
+        ]
+      },
+      "then": {
+        "required": [
+          "regressionRuns"
+        ],
+        "properties": {
+          "regressionRuns": {}
+        }
+      }
     }
   ],
   "definitions": {
@@ -1750,6 +1787,20 @@
             "$ref": "#/definitions/knowledgeCheck"
           }
         },
+        "regressionRefs": {
+          "type": "array",
+          "uniqueItems": true,
+          "items": {
+            "type": "string",
+            "pattern": "^REG-[A-Za-z0-9][A-Za-z0-9-]*$"
+          }
+        },
+        "regressionCandidates": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/regressionCandidate"
+          }
+        },
         "source": {
           "if": {
             "type": "object",
@@ -1908,6 +1959,131 @@
           }
         }
       ]
+    },
+    "regressionCandidate": {
+      "type": "object",
+      "required": ["title", "surface", "steps", "expected"],
+      "additionalProperties": false,
+      "properties": {
+        "id": {
+          "type": "string",
+          "pattern": "^REG-[A-Za-z0-9][A-Za-z0-9-]*$"
+        },
+        "title": { "type": "string", "minLength": 1, "pattern": "\\S" },
+        "surface": { "type": "string", "enum": ["browser", "api"] },
+        "suite": { "type": "string", "enum": ["smoke", "full"] },
+        "setup": { "type": "string" },
+        "steps": {
+          "type": "array",
+          "minItems": 1,
+          "items": { "type": "string", "minLength": 1 }
+        },
+        "expected": {
+          "type": "array",
+          "minItems": 1,
+          "items": {
+            "type": "object",
+            "required": ["kind", "value"],
+            "additionalProperties": false,
+            "properties": {
+              "kind": {
+                "type": "string",
+                "enum": [
+                  "visible-text",
+                  "api-status",
+                  "api-field",
+                  "url",
+                  "interaction"
+                ]
+              },
+              "value": { "type": "string", "minLength": 1, "pattern": "\\S" }
+            }
+          }
+        },
+        "sourceKind": { "type": "string", "enum": ["feature", "bug"] }
+      }
+    },
+    "regressionRun": {
+      "type": "object",
+      "required": [
+        "id",
+        "suite",
+        "caseIds",
+        "status",
+        "sourceRevision",
+        "configRevision",
+        "baseUrl",
+        "results",
+        "evidence",
+        "updatedAt"
+      ],
+      "additionalProperties": false,
+      "properties": {
+        "id": {
+          "type": "string",
+          "pattern": "^RR-[A-Za-z0-9][A-Za-z0-9._-]{0,127}$"
+        },
+        "suite": { "type": "string", "enum": ["smoke", "full", "custom"] },
+        "caseIds": {
+          "type": "array",
+          "minItems": 1,
+          "uniqueItems": true,
+          "items": {
+            "type": "string",
+            "pattern": "^REG-[A-Za-z0-9][A-Za-z0-9-]*$"
+          }
+        },
+        "taskIds": {
+          "type": "array",
+          "uniqueItems": true,
+          "items": { "type": "string", "minLength": 1 }
+        },
+        "deliveryRunId": {
+          "type": "string",
+          "pattern": "^DR-[A-Za-z0-9][A-Za-z0-9._-]{0,127}$"
+        },
+        "status": {
+          "type": "string",
+          "enum": [
+            "planned",
+            "running",
+            "passed",
+            "failed",
+            "blocked",
+            "skipped"
+          ]
+        },
+        "sourceRevision": {
+          "type": ["string", "null"],
+          "pattern": "^[0-9a-f]{7,64}$"
+        },
+        "configRevision": {
+          "type": ["string", "null"],
+          "pattern": "^[0-9a-f]{7,64}$"
+        },
+        "baseUrl": { "type": ["string", "null"] },
+        "results": {
+          "type": "array",
+          "items": {
+            "type": "object",
+            "required": ["caseId", "result", "evidence"],
+            "additionalProperties": false,
+            "properties": {
+              "caseId": {
+                "type": "string",
+                "pattern": "^REG-[A-Za-z0-9][A-Za-z0-9-]*$"
+              },
+              "result": { "type": "string", "enum": ["pass", "fail", "skipped"] },
+              "evidence": { "type": "string", "minLength": 1 }
+            }
+          }
+        },
+        "evidence": {
+          "type": "array",
+          "items": { "type": "string", "minLength": 1 }
+        },
+        "updatedAt": { "type": "string", "minLength": 1 }
+      }
     }
   }
 }