refactor(issue): Simplify issue and task structures by removing unused fields

.claude/workflows/cli-templates/schemas/solution-schema.json

@@ -3,20 +3,20 @@
   "title": "Issue Solution Schema",
   "description": "Schema for solution registered to an issue",
   "type": "object",
-  "required": ["id", "issue_id", "tasks", "status", "created_at"],
+  "required": ["id", "tasks", "is_bound", "created_at"],
   "properties": {
     "id": {
       "type": "string",
       "description": "Unique solution identifier",
       "pattern": "^SOL-[0-9]+$"
     },
-    "issue_id": {
+    "description": {
       "type": "string",
-      "description": "Parent issue ID"
+      "description": "High-level summary of the solution"
     },
-    "plan_session_id": {
+    "approach": {
       "type": "string",
-      "description": "Planning session that created this solution"
+      "description": "Technical approach or strategy"
     },
     "tasks": {
       "type": "array",
@@ -106,26 +106,9 @@
             "type": "integer",
             "description": "Estimated time to complete"
           },
-          "executor": {
-            "type": "string",
-            "enum": ["codex", "gemini", "agent", "auto"],
-            "default": "auto"
-          },
-          "lifecycle_status": {
-            "type": "object",
-            "description": "Lifecycle phase tracking",
-            "properties": {
-              "implemented": { "type": "boolean" },
-              "tested": { "type": "boolean" },
-              "regression_passed": { "type": "boolean" },
-              "accepted": { "type": "boolean" },
-              "committed": { "type": "boolean" }
-            }
-          },
           "status": {
             "type": "string",
-            "enum": ["pending", "ready", "executing", "completed", "failed", "blocked"],
-            "default": "pending"
+            "description": "Task status (optional, for tracking)"
           },
           "priority": {
             "type": "integer",
@@ -164,11 +147,6 @@
       "maximum": 1,
       "description": "Solution quality score (0.0-1.0)"
     },
-    "status": {
-      "type": "string",
-      "enum": ["draft", "candidate", "bound", "queued", "executing", "completed", "failed"],
-      "default": "draft"
-    },
     "is_bound": {
       "type": "boolean",
       "default": false,