Make no-output command test deterministic in MockLLM

[joone]

Motivation

• Make the Handle no output unit test deterministic across environments by ensuring the mock LLM returns a command that consistently produces no matches and triggers the intended "no output" code path.

Description

• Modify MockLLMAPI.getCommandForPrompt in src/llm/index.ts to return grep '__LOZ_TEST_NO_OUTPUT_9f8b7c__' README.md for the Find sfsdfef prompt so grep runs against a known file with a guaranteed-missing token.

Testing

• Ran npm run build which succeeded and ran npm test -- --grep "Handle no output" which produced 1 passing for the targeted test; running npm test -- test/command.test.ts showed the targeted Handle no output case passed while other unrelated tests failed due to environment-dependent services and missing API credentials.

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Codex Task