## Code Review

### expert_build/summarize.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: Clean refactor replacing the `entry` CLI subprocess dependency with direct file writing. The `source:` URL fallback parsing is correct — `line.split(":", 1)[1].strip()` handles `source: https://...` properly, and the `val.startswith(("http://", "https://"))` guard correctly rejects local paths. Removed `re` and `subprocess` imports are genuinely dead after the title-extraction and subprocess-call code was removed. The `date.today()` call inside the loop is harmless (midnight crossing would still produce correct dates). The provenance frontmatter always includes `source: {source_path}` (local path), with optional `source_url` and `source_id` — this is a good traceability improvement. Callers in `cli.py` and `pipeline.py` pass the same `args` namespace so integration is unaffected.

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### 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: Adds the same `source:` URL fallback pattern used in `summarize.py`. The `if not source_url` guard correctly gives `source_url:` priority when both keys exist. The generated entries from `summarize.py` will now have `source: {local_path}` which won't match the URL check — so there's no risk of local paths leaking into `SOURCE_URL` headers.

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### 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: Three new tests cover the matrix well: `source_url:` works (existing behavior), `source:` with URL works (new), `source:` with local path is rejected (guard). Each test captures the LLM prompt and asserts on `SOURCE_URL` presence/absence. One missing case: both `source_url:` and `source:` URL present simultaneously (verifying priority), but the guard logic is simple enough that this is low risk.

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### tests/test_summarize.py
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: Tests properly migrated from subprocess mocking to direct file assertions via `_find_entry()`. The `MagicMock` import removal is correct — no remaining usage. New provenance tests cover: source path in frontmatter, `source:` URL propagation to `source_url`, `source_id` pass-through, LLM summary in body, and directory structure. The `test_strips_frontmatter_before_summarizing` test was updated to use `source:` (the new key) while `test_strips_source_url_frontmatter` covers the existing `source_url:` key — good split.

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### SELF_REVIEW
LIMITATIONS: No spec or issue was provided, so the review focused on internal correctness. Could not verify whether downstream consumers of the entry format (e.g., `accept-beliefs`, other pipeline stages) expect the old `entry` CLI format or the new direct-write format. The `pipeline.py` caller was noted but its full context wasn't examined beyond the observation that it calls `cmd_summarize(sum_args)` with the same namespace shape.

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