fix(workflow): add typecheck script and fix remaining type errors

- Add typecheck script (bunx tsc --build) to package.json
- Update check script to run typecheck before biome
- Fix mock fetch casts in test files (bun-types preconnect)
- Fix RequestInfo → Request | string | URL in llm-extract test
- Fix ThreadContext generic cast in solve-issue-template test
- Fix git-exec.ts missing return and module resolution
- Remove @types/node from workflow-role-committer
- Add exports field to workflow-util-agent/package.json

packages/workflow-util-role/__tests__/create-role.test.ts

@@ -55,7 +55,8 @@ describe("createRole", () => {
   });
 
   test("runs AgentFn then structured extract", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 3 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 3 })))) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const agent: AgentFn = async (_ctx, prompt) => prompt;
@@ -73,7 +74,8 @@ describe("createRole", () => {
   });
 
   test("passes ThreadContext to AgentFn", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 0 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 0 })))) as unknown as typeof fetch;
 
     const seen: ThreadContext[] = [];
     const agent: AgentFn = async (ctx, _prompt) => {
@@ -94,7 +96,8 @@ describe("createRole", () => {
   });
 
   test("resolves dynamic systemPrompt functions before AgentFn", async () => {
-    globalThis.fetch = () => Promise.resolve(toolCallResponse(JSON.stringify({ n: 99 })));
+    globalThis.fetch = (() =>
+      Promise.resolve(toolCallResponse(JSON.stringify({ n: 99 })))) as unknown as typeof fetch;
 
     const schema = z.object({ n: z.number() });
     const agent: AgentFn = async (_ctx, prompt) => prompt;