feat(workflow): analyst→architect→planner→implementer⇄reviewer role pipeline

docs/schemas/analysis.json

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+{
+  "type": "object",
+  "properties": {
+    "summary": {
+      "type": "string",
+      "description": "what the request is asking for, in your own words"
+    },
+    "requirements": {
+      "type": "string",
+      "description": "concrete requirements / acceptance criteria, newline-separated"
+    },
+    "affected_areas": {
+      "type": "string",
+      "description": "files, modules, or subsystems likely involved, newline-separated"
+    }
+  },
+  "required": ["summary", "requirements"],
+  "additionalProperties": true
+}

docs/schemas/design.json

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+{
+  "type": "object",
+  "properties": {
+    "approach": {
+      "type": "string",
+      "description": "the chosen approach and why"
+    },
+    "components": {
+      "type": "string",
+      "description": "components/files to add or change, newline-separated"
+    },
+    "risks": {
+      "type": "string",
+      "description": "risks, trade-offs, or open questions, newline-separated"
+    }
+  },
+  "required": ["approach", "components"],
+  "additionalProperties": true
+}

docs/schemas/impl_plan.json

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+{
+  "type": "object",
+  "properties": {
+    "steps": {
+      "type": "string",
+      "description": "ordered, individually verifiable implementation steps, newline-separated"
+    },
+    "verification": {
+      "type": "string",
+      "description": "how completion is checked (commands, tests), newline-separated"
+    }
+  },
+  "required": ["steps"],
+  "additionalProperties": true
+}