test(agent-orchestrator): use vitest mock for available agents provider

[lalalune]

Summary

Fixes the available-agents.test.ts harness after #13289 introduced import { mock } from "bun:test", which the package's Vitest command cannot resolve.

The test still installs the framework-state mock before dynamically importing availableAgentsProvider, but uses vi.mock(...) so it runs under the existing Vitest harness.

Verification

bun run --cwd plugins/plugin-agent-orchestrator test -- __tests__/unit/available-agents.test.ts

Result: 1 test file passed, 5 tests passed.

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