Fix test failures after Deno 2.6.3 upgrade

[Copilot]

After bumping Deno from alpine-2.5.6 to alpine-2.6.3, tests failed due to TypeScript type resolution issues with the assert import alias.

Changes

• Test imports: Updated 6 test files to import directly from @std/assert instead of the assert alias

  • main.test.ts, src/commands/options.test.ts, src/commands/set.test.ts
  • src/hooks/post.test.ts, src/util/increment.test.ts, src/util/version.test.ts

• Dependencies: Updated deno.json to ensure assert alias points to @std/assert@^1.0.14

• Lock file: Regenerated deno.lock with compatible dependency versions

The imports changed from:

import { assertEquals } from "assert";

To:

import { assertEquals } from "@std/assert";

This resolves TypeScript type checking errors while maintaining runtime compatibility.

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