chore: clear pre-existing lint warnings

Annotate the intentional NUL-byte regex in log-sink, drop two stale
eslint-disable directives whose underlying any-uses are gone, and swap
@ts-ignore for @ts-expect-error in routes.test.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/dashboard/src/__tests__/routes-skills.test.ts

@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
 import { describe, it, expect, vi } from "vitest";
 import { EventEmitter } from "node:events";
 import type { Task } from "@fusion/core";

packages/dashboard/src/__tests__/routes.test.ts

@@ -8944,7 +8944,7 @@ describe("Planning Mode Routes", () => {
           question: "What is your preference?",
           description: "Please choose",
         };
-        // @ts-ignore - accessing internal state for testing
+        // @ts-expect-error - accessing internal state for testing
         session!.currentQuestion = mockQuestion;
 
         // Broadcast a complete event after a short delay so the stream ends