feat(FN-2924): merge fusion/fn-2924

- Add task provenance display to TaskDetailModal, surfacing AI-generated merge commit summaries so users understand when and why tasks landed
- New `ai-summarize` module in core with structured commit summarization logic and tests
- Extend CLI `fn task show` with provenance output
- Refactor merger to produce cleaner merge commit messages with task context
- Update SettingsModal to expose AI summarization toggle (hidden behind feature flag)
- Adjust QuickChatFAB styling for theme compatibility
- Update scheduler and node-routing policy tests to match new behavior
- Add changeset for `@runfusion/fusion` minor release

Commits merged:
- feat(FN-2924): display task provenance in dashboard and cli
- feat(FN-2971): merge fusion/fn-2971
- feat(FN-2947): merge fusion/fn-2947
- feat(FN-2970): merge fusion/fn-2970
- feat(FN-2956): merge fusion/fn-2956

Files changed:
.changeset/add-ai-merge-commit-summary.md          |   5 +
 docs/cli-reference.md                              |   3 +-
 docs/settings-reference.md                         |   3 +
 packages/cli/src/commands/__tests__/task.test.ts   |  44 ++++-
 packages/cli/src/commands/task.ts                  |  55 +++++++
 packages/core/src/__tests__/ai-summarize.test.ts   |  64 ++++++++
 packages/core/src/ai-summarize.ts                  | 114 +++++++++++++
 packages/core/src/index.ts                         |   3 +
 packages/core/src/settings-schema.ts               |   1 +
 packages/core/src/types.ts                         |   4 +
 packages/dashboard/app/components/QuickChatFAB.css |  17 +-
 packages/dashboard/app/components/QuickChatFAB.tsx |   2 +-
 .../dashboard/app/components/SettingsModal.css     |  11 +-
 .../dashboard/app/components/SettingsModal.tsx     |  22 ++-
 .../dashboard/app/components/TaskDetailModal.css   |  40 +++++
 .../dashboard/app/components/TaskDetailModal.tsx   |  82 +++++++++-
 .../__tests__/SettingsModalNodeRouting.test.tsx    |  12 +-
 .../components/__tests__/TaskDetailModal.test.tsx  |  81 ++++++++-
 packages/engine/src/__tests__/merger.test.ts       |  75 +++++++++
 .../src/__tests__/node-routing-policy.test.ts      |  25 ++-
 .../src/__tests__/scheduler-node-routing.test.ts   |  18 +-
 packages/engine/src/merger.ts                      | 181 +++++++++------------
 packages/engine/src/scheduler.ts                   |   8 +-
 23 files changed, 723 insertions(+), 147 deletions(-)

Fusion-Task-Id: FN-2924

packages/cli/src/commands/task.ts

@@ -18,6 +18,57 @@ import { findNodeByNameOrId } from "./node.js";
 
 const STEP_STATUSES: StepStatus[] = ["pending", "in-progress", "done", "skipped"];
 
+function getGitHubIssueUrl(sourceMetadata: unknown): string | undefined {
+  if (!sourceMetadata || typeof sourceMetadata !== "object") return undefined;
+  const issueUrl = (sourceMetadata as { issueUrl?: unknown }).issueUrl;
+  return typeof issueUrl === "string" && issueUrl.length > 0 ? issueUrl : undefined;
+}
+
+function formatTaskSource(task: {
+  sourceType?: string;
+  sourceAgentId?: string;
+  sourceParentTaskId?: string;
+  sourceMetadata?: unknown;
+}): string | null {
+  switch (task.sourceType) {
+    case "dashboard_ui":
+      return "Dashboard";
+    case "quick_chat":
+      return "Quick Chat";
+    case "chat_session":
+      return "Chat Session";
+    case "agent_heartbeat":
+      return task.sourceAgentId ? `Agent (${task.sourceAgentId})` : "Agent";
+    case "automation":
+      return "Automation";
+    case "cron":
+      return "Scheduled Task";
+    case "workflow_step":
+      return "Workflow Step";
+    case "github_import": {
+      const issueUrl = getGitHubIssueUrl(task.sourceMetadata);
+      return issueUrl ? `GitHub Import (${issueUrl})` : "GitHub Import";
+    }
+    case "task_refine":
+      return task.sourceParentTaskId
+        ? `Refinement of ${task.sourceParentTaskId}`
+        : "Refinement";
+    case "task_duplicate":
+      return task.sourceParentTaskId
+        ? `Duplicate of ${task.sourceParentTaskId}`
+        : "Duplicate";
+    case "cli":
+      return "CLI";
+    case "api":
+      return "API";
+    case "recovery":
+      return "Recovery";
+    case "unknown":
+    default:
+      return null;
+  }
+}
+
 interface CommandContext {
   store: TaskStore;
   projectPath: string;
@@ -519,6 +570,10 @@ export async function runTaskShow(id: string, projectName?: string) {
   if (settings.unavailableNodePolicy) {
     console.log(`  Unavailable Node Policy: ${settings.unavailableNodePolicy}`);
   }
+  const sourceSummary = formatTaskSource(task);
+  if (sourceSummary) {
+    console.log(`  Source: ${sourceSummary}`);
+  }
   console.log();
 
   // Steps