feat(FN-3871): add tracking issue title/body formatters

Added GitHub tracking issue title and body formatters to the dashboard (`packages/dashboard/src/github-tracking.ts`), with corresponding tests and documentation in the architecture docs. A changeset was included for this user-facing feature.

Fusion-Task-Id: FN-3871

.changeset/FN-3871-github-issue-title-body.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+GitHub tracking issues now use the format `[FN-XXXX] Title` for the title and a short plaintext summary prefixed with `Fusion task: FN-XXXX` for the body. The full task prompt is never included and no hyperlink back to Fusion is added.

docs/architecture.md

@@ -1238,6 +1238,8 @@ Git dashboard routes are registered in `register-git-github.ts`.
 
 When a task is created, Fusion only attempts GitHub issue creation if per-task tracking is explicitly enabled (`task.githubTracking.enabled === true`). The lifecycle then resolves the repo in priority order: task override (`repoOverride`) → project `githubTrackingDefaultRepo` → global `githubTrackingDefaultRepo`. If no repo resolves, task creation still succeeds and an activity entry records the skip reason. GitHub API/CLI failures are best-effort only (swallowed with warning), so task creation is never blocked by GitHub availability.
 
+When Fusion does create a tracking issue, it formats the title as `[FN-XXXX] Task title` and sends a short plain-text body prefixed with `Fusion task: FN-XXXX`. The body is a bounded summary snippet (not full task prompt content), and Fusion does not include any hyperlink back to the local dashboard.
+
 ### Worktree model
 - Each active task runs in isolated worktree under `.worktrees/*`
 - Executor creates branches like `fusion/{task-id}` (`executor.ts`)

packages/dashboard/src/__tests__/github-tracking.test.ts

@@ -1,6 +1,10 @@
 import { describe, expect, it, vi } from "vitest";
 import type { Task } from "@fusion/core";
-import { maybeCreateTrackingIssue } from "../github-tracking.js";
+import {
+  formatTrackingIssueBody,
+  formatTrackingIssueTitle,
+  maybeCreateTrackingIssue,
+} from "../github-tracking.js";
 
 function buildTask(overrides: Partial<Task> = {}): Task {
   return {
@@ -17,6 +21,82 @@ function buildTask(overrides: Partial<Task> = {}): Task {
   } as Task;
 }
 
+describe("formatTrackingIssueTitle", () => {
+  it("formats a normal title", () => {
+    expect(formatTrackingIssueTitle({ id: "FN-1", title: "Hello" })).toBe("[FN-1] Hello");
+  });
+
+  it("falls back for blank title", () => {
+    expect(formatTrackingIssueTitle({ id: "FN-1", title: "   \n\t " })).toBe("[FN-1] Untitled task");
+  });
+
+  it("collapses multiline whitespace", () => {
+    expect(formatTrackingIssueTitle({ id: "FN-1", title: "Hello\n\tWorld" })).toBe("[FN-1] Hello World");
+  });
+
+  it("truncates very long titles while preserving id prefix", () => {
+    const longTitle = "x".repeat(400);
+    const formatted = formatTrackingIssueTitle({ id: "FN-123", title: longTitle });
+    expect(formatted.startsWith("[FN-123] ")).toBe(true);
+    expect(formatted.length).toBeLessThanOrEqual(240);
+    expect(formatted.endsWith("…")).toBe(true);
+  });
+});
+
+describe("formatTrackingIssueBody", () => {
+  it("prefers first description paragraph", () => {
+    expect(formatTrackingIssueBody({
+      id: "FN-X",
+      description: "Primary paragraph\n\nSecond paragraph",
+      prompt: "Prompt paragraph",
+      summary: "Summary paragraph",
+    })).toBe("Fusion task: FN-X\n\nPrimary paragraph");
+  });
+
+  it("uses prompt when description is empty", () => {
+    expect(formatTrackingIssueBody({ id: "FN-X", description: "", prompt: "Prompt paragraph", summary: "Summary" }))
+      .toBe("Fusion task: FN-X\n\nPrompt paragraph");
+  });
+
+  it("uses summary when description and prompt are unavailable", () => {
+    expect(formatTrackingIssueBody({ id: "FN-X", summary: "Summary paragraph" }))
+      .toBe("Fusion task: FN-X\n\nSummary paragraph");
+  });
+
+  it("falls back when prompt is undefined and sources are empty", () => {
+    expect(formatTrackingIssueBody({ id: "FN-X", description: "  ", summary: "   " }))
+      .toBe("Fusion task: FN-X\n\nNo summary available.");
+  });
+
+  it("strips markdown noise including headings, bullets, and code fences", () => {
+    const body = formatTrackingIssueBody({
+      id: "FN-X",
+      description: "# Heading\n- bullet\n1. numbered\n```ts\nconst x = 1;\n```\nfinal",
+    });
+    expect(body).toBe("Fusion task: FN-X\n\nHeading bullet numbered const x = 1; final");
+  });
+
+  it("truncates summary to 500 characters with ellipsis", () => {
+    const body = formatTrackingIssueBody({ id: "FN-X", description: "a".repeat(600) });
+    const summary = body.replace("Fusion task: FN-X\n\n", "");
+    expect(summary.length).toBe(500);
+    expect(summary.endsWith("…")).toBe(true);
+  });
+
+  it("removes fusion-style localhost task urls", () => {
+    const body = formatTrackingIssueBody({
+      id: "FN-1",
+      description: "See http://localhost:4040/tasks/FN-1 and continue",
+    });
+    expect(body).not.toContain("localhost");
+    expect(body).not.toMatch(/https?:\/\/[^\s]*\/tasks\/FN-/);
+  });
+
+  it("always starts with fusion task reference", () => {
+    expect(formatTrackingIssueBody({ id: "FN-99", description: "hello" }).startsWith("Fusion task: FN-99\n\n")).toBe(true);
+  });
+});
+
 describe("maybeCreateTrackingIssue", () => {
   it("returns tracking_disabled when not enabled", async () => {
     const result = await maybeCreateTrackingIssue(buildTask({ githubTracking: { enabled: false } }), {
@@ -89,7 +169,7 @@ describe("maybeCreateTrackingIssue", () => {
     const linkGithubIssue = vi.fn();
     const recordActivity = vi.fn();
 
-    const result = await maybeCreateTrackingIssue(buildTask({ title: "Test", githubTracking: { enabled: true } }), {
+    const result = await maybeCreateTrackingIssue(buildTask({ title: "Test", description: "Short body", githubTracking: { enabled: true } }), {
       taskStore: { linkGithubIssue, recordActivity } as any,
       githubClient: { createIssue } as any,
       projectSettings: {},
@@ -99,6 +179,12 @@ describe("maybeCreateTrackingIssue", () => {
 
     expect(result.created).toBe(true);
     expect(createIssue).toHaveBeenCalledTimes(1);
+    expect(createIssue).toHaveBeenCalledWith(expect.objectContaining({
+      title: "[FN-1] Test",
+      body: expect.stringMatching(/^Fusion task: FN-1\n\n/),
+    }));
+    const calledBody = createIssue.mock.calls[0][0]?.body as string;
+    expect(calledBody.length).toBeLessThanOrEqual("Fusion task: FN-1\n\n".length + 500);
     expect(linkGithubIssue).toHaveBeenCalledWith("FN-1", expect.objectContaining({ owner: "o", repo: "r", number: 12 }));
     expect(recordActivity).toHaveBeenCalledWith(expect.objectContaining({
       metadata: expect.objectContaining({ type: "github-issue-created", repo: "o/r", number: 12 }),

packages/dashboard/src/github-tracking.ts

@@ -2,6 +2,69 @@ import type { GlobalSettings, ProjectSettings, Task, TaskStore } from "@fusion/c
 import type { CreatedIssue } from "./github.js";
 import type { GitHubClient } from "./github.js";
 
+const TRACKING_ISSUE_TITLE_LIMIT = 240;
+const TRACKING_ISSUE_BODY_SUMMARY_LIMIT = 500;
+
+function collapseWhitespace(value: string): string {
+  return value.replace(/\s+/g, " ").trim();
+}
+
+function firstNonEmptyParagraph(value: string | undefined): string | null {
+  if (!value) return null;
+  const paragraph = value
+    .split(/\n\s*\n/g)
+    .map((part) => part.trim())
+    .find((part) => part.length > 0);
+  return paragraph && paragraph.length > 0 ? paragraph : null;
+}
+
+function sanitizeSummaryText(value: string): string {
+  const cleaned = value
+    .split(/\r?\n/)
+    .filter((line) => !/^```/.test(line.trim()))
+    .map((line) => line.replace(/^\s*#{1,6}\s+/, "").replace(/^\s*(?:[-*+]\s+|\d+\.\s+)/, ""))
+    .join(" ");
+
+  const withoutFusionUrls = cleaned
+    .replace(/https?:\/\/localhost(?::\d+)?\/[^\s)]*/gi, " ")
+    .replace(/https?:\/\/[^\s)]*\/tasks\/FN-\d+[^\s)]*/gi, " ");
+
+  return collapseWhitespace(withoutFusionUrls);
+}
+
+export function formatTrackingIssueTitle(task: Pick<Task, "id" | "title">): string {
+  const prefix = `[${task.id}] `;
+  const baseTitle = collapseWhitespace(task.title ?? "") || "Untitled task";
+  const maxTitleLength = Math.max(1, TRACKING_ISSUE_TITLE_LIMIT - prefix.length);
+
+  if (baseTitle.length <= maxTitleLength) {
+    return `${prefix}${baseTitle}`;
+  }
+
+  const truncated = `${baseTitle.slice(0, Math.max(0, maxTitleLength - 1)).trimEnd()}…`;
+  return `${prefix}${truncated}`;
+}
+
+export function formatTrackingIssueBody(task: {
+  id: string;
+  title?: string;
+  description?: string;
+  summary?: string;
+  prompt?: string;
+}): string {
+  const source = firstNonEmptyParagraph(task.description)
+    ?? firstNonEmptyParagraph(task.prompt)
+    ?? task.summary?.trim()
+    ?? "No summary available.";
+
+  const sanitized = sanitizeSummaryText(source) || "No summary available.";
+  const summary = sanitized.length > TRACKING_ISSUE_BODY_SUMMARY_LIMIT
+    ? `${sanitized.slice(0, TRACKING_ISSUE_BODY_SUMMARY_LIMIT - 1).trimEnd()}…`
+    : sanitized;
+
+  return `Fusion task: ${task.id}\n\n${summary}`;
+}
+
 export interface MaybeCreateTrackingIssueDeps {
   taskStore: TaskStore;
   githubClient: GitHubClient;
@@ -52,8 +115,8 @@ export async function maybeCreateTrackingIssue(
     return { created: false, reason: "no_repo_configured" };
   }
 
-  const title = `[${task.id}] ${task.title ?? task.description.slice(0, 80)}`;
-  const body = `Tracking issue for ${task.id}.\n\n_Summary placeholder — populated by FN-3871._`;
+  const title = formatTrackingIssueTitle(task);
+  const body = formatTrackingIssueBody(task);
 
   try {
     const issue = await deps.githubClient.createIssue({ owner: repo.owner, repo: repo.repo, title, body });