### expert_build/cli.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The addition of the `--parallel` argument correctly enables user control over concurrency. The argument uses the appropriate type (`int`) and a safe default (`1`), which maintains backward compatibility.
---

### expert_build/propose.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The transition to `asyncio` for LLM calls is correctly implemented using a semaphore to limit concurrency. Definining `_process_batch` as an internal async helper keeps the logic clean. The use of `asyncio.run` at the command level is appropriate for a CLI entry point. Writing results to the output file and updating processed entries in a synchronous loop after gathering prevents race conditions. One minor inefficiency is that `_save_processed` is called for every batch result and re-reads all accumulated `successful_entries`, but this is acceptable for typical batch sizes.
---

### tests/test_propose.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: Existing tests were correctly updated to patch the new `invoke` async function using `AsyncMock`. A new test case `test_parallel_processes_all_batches` specifically verifies the parallel execution logic, ensuring that all batches are processed and their results are aggregated correctly.
---

### SELF_REVIEW
LIMITATIONS: The review assumes that `expert-build` is primarily used as a CLI tool. If `cmd_propose_beliefs` were ever called from within an existing `asyncio` event loop (e.g., in a long-running server), `asyncio.run` would raise a `RuntimeError`. However, given the project structure, this is standard practice for CLI commands. I also observed that `invoke_sync` remains in `llm.py` as a wrapper, which safely supports other parts of the codebase that haven't been migrated to async yet.
---
