## Code Review

### expert_build/prompts.py (SUMMARIZE modification)
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: The `SUMMARIZE` template change from a fixed `## Overview` heading to `## <Descriptive Title>` is a clean prompt improvement. The `{content}` placeholder is preserved. Tests at lines 231 and 239 verify the new marker and placeholder exist.

---

### expert_build/prompts.py (SUMMARIZE_CODE addition)
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: Well-structured code summarization prompt with appropriate sections (Usage Patterns, API and Configuration, Key Behaviors, Relationships). Has the required `{content}` placeholder. Imported and used in `summarize.py:85`. Tests at lines 235 and 243 verify structure.

---

### expert_build/summarize.py:cmd_summarize (file discovery)
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: File discovery extended from `*.md` to `[*.md, *.py]` with stable `key=lambda p: p.name` sort. The error message updated to match. Four tests cover this: `test_discovers_md_files`, `test_discovers_py_files`, `test_discovers_both_md_and_py`, `test_ignores_other_extensions`.

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### expert_build/summarize.py:cmd_summarize (truncation warning)
VERDICT: CONCERN
CORRECTNESS: QUESTIONABLE
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: PARTIAL
INTEGRATION: WIRED
REASONING: The `.pdf` suffix branch at line 76 is dead code — file discovery only globs `*.md` and `*.py`, so `source_path.suffix == ".pdf"` is unreachable. This isn't harmful but is misleading; a reader might think PDF processing is supported when it isn't (at this stage of the pipeline). The generic `else` branch works correctly for both `.md` and `.py` files. No test covers the PDF branch (because it can't be reached), but the reachable paths are well-tested.

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### expert_build/summarize.py:cmd_summarize (template selection)
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: COVERED
INTEGRATION: WIRED
REASONING: `template = SUMMARIZE_CODE if source_path.suffix == ".py" else SUMMARIZE` at line 85 is clean and correct. Two dedicated tests (`test_uses_summarize_code_for_py`, `test_uses_summarize_for_md`) verify the right template is selected by asserting on prompt content keywords.

---

### 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: 17 well-organized tests covering file discovery, template selection, truncation, manifest idempotency, frontmatter stripping, and prompt template structure. Mocking strategy is sound — `invoke_sync`, `check_model_available`, and `subprocess.run` are patched at the right levels. Minor nit: unused `calls = []` on line 69 in `test_discovers_both_md_and_py`. The `work_dir` fixture with `monkeypatch.chdir` properly isolates the `.summarized` manifest.

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## Summary

Clean, well-tested change. One substantive concern:

**Dead `.pdf` branch** (`summarize.py:76-78`): The truncation warning has a special case for `.pdf` files, but the file discovery at line 28-31 only globs `*.md` and `*.py`. The PDF branch can never execute. Consider either removing it or adding a comment that it's forward-looking. Alternatively, if PDFs can enter from a different path (e.g., `chunk-pdf` output), verify that flow and document it.

### SELF_REVIEW
LIMITATIONS: I did not have visibility into the `chunk-pdf` command's output format to determine if PDFs could ever reach `cmd_summarize` through an indirect path. The full observation data provided good coverage of the function body, callers, and test structure.

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### FEATURE_REQUESTS
- Include git blame context for modified lines to distinguish pre-existing code from new additions (the `.pdf` branch might be pre-existing, which would downgrade the concern)
- Show the CLI argument parser definition for `cmd_summarize` to verify all args are tested

---
