FN-5780: inherit source GitHub tracking when refining tasks

Preserve GitHub linking intent when creating refinement tasks from completed work.

- Set refinement `githubTracking` from the source task state during `refineTask`
- Opt out refinements when the source task is unlinked or explicitly disabled
- Carry forward `enabled` and optional `repoOverride` for linked sources without copying source issue metadata
- Add store-level tests covering unlinked, disabled, linked, and issue-only source tracking states
- Document refinement GitHub tracking inheritance behavior in task-management docs
- Add a patch changeset for `@runfusion/fusion`

Files changed:
 .changeset/fn-5780-refine-github-tracking.md  |  5 ++
 docs/task-management.md                       |  1 +
 packages/core/src/__tests__/store-ops.test.ts | 71 +++++++++++++++++++++++++++
 packages/core/src/store.ts                    | 12 +++++
 4 files changed, 89 insertions(+)

Fusion-Task-Id: FN-5780
Fusion-Task-Lineage: 88c1ce01-6efd-48c1-bbdd-704a821055d7

packages/core/src/__tests__/store-ops.test.ts

@@ -511,6 +511,77 @@ describe("TaskStore", () => {
       expect(refined.status).toBeUndefined();
     });
 
+    it("opts out github tracking when source has no githubTracking", async () => {
+      const task = await store.createTask({ description: "Original task" });
+      await store.moveTask(task.id, "todo");
+      await store.moveTask(task.id, "in-progress");
+      await store.moveTask(task.id, "in-review");
+      await store.moveTask(task.id, "done");
+
+      const refined = await store.refineTask(task.id, "Need improvements");
+
+      expect(refined.githubTracking?.enabled).toBe(false);
+    });
+
+    it("keeps github tracking disabled when source is explicitly disabled", async () => {
+      const task = await store.createTask({ description: "Original task" });
+      await store.updateGithubTracking(task.id, { enabled: false });
+      await store.moveTask(task.id, "todo");
+      await store.moveTask(task.id, "in-progress");
+      await store.moveTask(task.id, "in-review");
+      await store.moveTask(task.id, "done");
+
+      const refined = await store.refineTask(task.id, "Need improvements");
+
+      expect(refined.githubTracking?.enabled).toBe(false);
+    });
+
+    it("inherits enabled and repoOverride without copying linked issue", async () => {
+      const task = await store.createTask({ description: "Original task" });
+      await store.updateGithubTracking(task.id, {
+        enabled: true,
+        repoOverride: "owner/repo",
+        issue: {
+          number: 12,
+          url: "https://github.com/owner/repo/issues/12",
+          title: "Tracked",
+          state: "open",
+          updatedAt: new Date().toISOString(),
+        },
+      });
+      await store.moveTask(task.id, "todo");
+      await store.moveTask(task.id, "in-progress");
+      await store.moveTask(task.id, "in-review");
+      await store.moveTask(task.id, "done");
+
+      const refined = await store.refineTask(task.id, "Need improvements");
+
+      expect(refined.githubTracking).toEqual({ enabled: true, repoOverride: "owner/repo" });
+      expect(refined.githubTracking?.issue).toBeUndefined();
+    });
+
+    it("treats linked issue without enabled flag as linked for refinement", async () => {
+      const task = await store.createTask({ description: "Original task" });
+      await store.updateGithubTracking(task.id, {
+        issue: {
+          number: 99,
+          url: "https://github.com/owner/repo/issues/99",
+          title: "Tracked",
+          state: "open",
+          updatedAt: new Date().toISOString(),
+        },
+      });
+      await store.moveTask(task.id, "todo");
+      await store.moveTask(task.id, "in-progress");
+      await store.moveTask(task.id, "in-review");
+      await store.moveTask(task.id, "done");
+
+      const refined = await store.refineTask(task.id, "Need improvements");
+
+      expect(refined.githubTracking?.enabled).toBe(true);
+      expect(refined.githubTracking?.issue).toBeUndefined();
+    });
+
     it("creates PROMPT.md for the refinement", async () => {
       const task = await store.createTask({ description: "Original task" });
       await store.moveTask(task.id, "todo");

packages/core/src/store.ts

@@ -4210,6 +4210,17 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
           const removed = extractTaskIdTokens(`Refinement: ${sourceLabel}`).filter((token) => token !== newId.toUpperCase());
           storeLog.log(`[title-id-drift] normalized title for ${newId}: removed=[${removed.join(",")}]`);
         }
+        const sourceGithubLinked = sourceTask.githubTracking?.enabled === true || Boolean(sourceTask.githubTracking?.issue);
+        // FN-5780: refinement should inherit source linking intent so unlinked tasks stay opted out from auto-create defaults.
+        const refinementGithubTracking = sourceGithubLinked
+          ? {
+            enabled: true,
+            ...(sourceTask.githubTracking?.repoOverride
+              ? { repoOverride: sourceTask.githubTracking.repoOverride }
+              : {}),
+          }
+          : { enabled: false };
+
         const newTask: Task = {
           id: newId,
           lineageId: generateTaskLineageId(),
@@ -4220,6 +4231,7 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
           dependencies: [id],
           sourceType: "task_refine",
           sourceParentTaskId: id,
+          githubTracking: refinementGithubTracking,
           steps: [],
           currentStep: 0,
           log: [{ timestamp: now, action: `Created as refinement of ${id}` }],