Fix test failure: Add MockLLMAPI for test mode

[Copilot]

Rebase Branch on Current Main - COMPLETE

Plan:

• Check current branch state and identify commits to rebase
• Fetch latest main branch from origin
• Perform rebase of current branch onto main
• Resolve conflicts in 5 files (config/index.ts, loz.ts, llm/index.ts, index.ts, README.md)
• Rebuild and verify tests still pass
• Force push rebased branch to remote

Rebase Summary:

Successfully rebased copilot/fix-linux-command-test onto main (commit fbdaae1).

Changes Rebased:

• MockLLMAPI Implementation: Added mock LLM API for test mode
• Config Test Mode Handling: Skip interactive prompts when MOCHA_ENV=test
• Test Mode Detection: Use MockLLMAPI when running in test mode

Conflicts Resolved:

1. src/config/index.ts: Merged test mode check into current config loading logic
2. src/loz.ts: Added MockLLMAPI import and test mode initialization
3. src/llm/index.ts: Added MockLLMAPI class implementation
4. src/index.ts: Kept main version (includes new agent mode features)
5. README.md: Kept main version (includes agent mode documentation)

Test Results After Rebase:

✅ Build successful
✅ "Handle no output" test passes
✅ All "Linux Command Test" suite tests pass (3/3)

The branch now has 1 clean commit on top of the latest main branch.

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