### expert_build/cli.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: The `index-sources` command is correctly registered in the CLI parser following the project's established patterns. The use of `_lazy` for command mapping maintains fast startup times by deferring the import of `index_sources.py` and its dependencies until needed.
---

### expert_build/index_sources.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The implementation provides a robust indexing pipeline using SQLite FTS5. The choice of an "external content" table with a manual `rebuild` step is an efficient way to handle batch indexing. The logic correctly integrates with existing language-specific chunking utilities and handles frontmatter metadata (like `source_url`) appropriately. The inclusion of a `--rebuild` flag and an idempotency check (skipping already indexed files) makes the tool practical for iterative use.
---

### tests/test_index_sources.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The test suite is comprehensive and well-structured. It verifies not only the high-level CLI command but also the underlying database initialization and FTS search capabilities. It covers critical edge cases such as recursive directory traversal, skipping existing files, and large file chunking.
---

### SELF_REVIEW
LIMITATIONS: The review of CLI integration relies on the `_lazy` function behavior observed in the code, but without seeing the full `test_cli.py`, I cannot confirm if new integration tests were added there; however, `test_index_sources.py` provides sufficient end-to-end verification of the command logic.
---
