refactor: extract planner and coder into standalone role packages

- New @uncaged/workflow-role-planner (phaseSchema, createPlannerRole)
- New @uncaged/workflow-role-coder (coderMetaSchema, createCoderRole)
- solve-issue template imports from new packages, keeps dry-run defaults

小橘 <xiaoju@shazhou.work>

packages/workflow-role-coder/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "dist",
+    "composite": true
+  },
+  "include": ["src/**/*.ts"],
+  "references": [
+    { "path": "../workflow" },
+    { "path": "../workflow-agent-llm" },
+    { "path": "../workflow-util-role" }
+  ]
+}