chore: remove all dryRun infrastructure

dryRun no longer needed — tests use mock agents + mock fetch instead.
Removes isDryRun from WorkflowFnOptions, dryRun from ExtractConfig,
dryRunMeta from RoleDefinition, --dry-run from CLI, and all related
plumbing in engine/worker/fork/extract.

小橘 <xiaoju@shazhou.work>

packages/workflow-role-committer/__tests__/committer.test.ts

@@ -3,8 +3,12 @@ import { describe, expect, test } from "bun:test";
 import { committerMetaSchema, committerRole } from "../src/committer.js";
 
 describe("committerRole", () => {
-  test("dryRunMeta validates against schema", () => {
-    const parsed = committerMetaSchema.safeParse(committerRole.dryRunMeta);
+  test("committed sample validates against schema", () => {
+    const parsed = committerMetaSchema.safeParse({
+      status: "committed" as const,
+      branch: "feat/example",
+      commitSha: "abc1234",
+    });
     expect(parsed.success).toBe(true);
   });
 

packages/workflow-role-committer/src/committer.ts

@@ -29,9 +29,4 @@ export const committerRole: RoleDefinition<CommitterMeta> = {
   description: "Creates branch, commits, and pushes when review passes.",
   systemPrompt: COMMITTER_SYSTEM,
   schema: committerMetaSchema,
-  dryRunMeta: {
-    status: "committed",
-    branch: "dry-run/placeholder",
-    commitSha: "0000000",
-  },
 };