### ftl_code_expert/git_utils.py:list_source_files
VERDICT: CONCERN
CORRECTNESS: QUESTIONABLE
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: Logic is sound for the happy path. The BFS sort `(p.count(os.sep), p)` correctly orders by depth. However, `git ls-files` always emits forward-slash separators, while the sort key uses `os.sep`. On macOS (current platform) this works because `os.sep == '/'`, but it's a latent cross-platform bug — on Windows, `os.sep` is `\\` so every file would get `count=0` and the depth sort would be flat. Minor: no upper bound on returned files — a large monorepo could queue thousands of topics in one shot. No tests exist for this function.

---

### ftl_code_expert/git_utils.py:BINARY_EXTENSIONS
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: Reasonable blocklist. Extension-less files (Makefile, Dockerfile, LICENSE) correctly pass through since empty string is not in the set. `frozenset` is the right choice for a module-level constant used in membership tests. Could be more exhaustive (`.wasm`, `.parquet`, `.arrow`) but covers the common cases well.

---

### ftl_code_expert/cli.py:scan
VERDICT: CONCERN
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: The ordering is intentional — file topics are queued before LLM-suggested topics so that BFS file exploration has priority. `add_topics` deduplicates by `target`, so if the LLM later suggests a file that was already queued, it's correctly skipped. The `project_dir` extraction was hoisted above both calls, avoiding a redundant `_get_project_dir` call — good. One concern: for a repo with 5,000 tracked source files, `add_topics` loads the queue JSON, builds a set of all existing targets, iterates all 5,000 topics, then serializes back — all synchronous and in-memory. No test coverage for the scan command at all.

---

### ftl_code_expert/cli.py (import cleanup)
VERDICT: PASS
CORRECTNESS: VALID
SPEC_COMPLIANCE: N/A
ISSUE_COMPLIANCE: N/A
BELIEF_COMPLIANCE: N/A
TEST_COVERAGE: UNTESTED
INTEGRATION: WIRED
REASONING: `Topic` moved from two inline `from .topics import Topic` statements (in `walk_commits` at line 1337 and `research` at line 3788) to the top-level import block. The observation confirms no stale references remain. Clean improvement that reduces redundancy.

---

### SELF_REVIEW
LIMITATIONS: No test files exist for either `git_utils.py` or the `scan` CLI command, so there's nothing to check for broken assertions. Could not verify the `Topic` dataclass fields directly (observation returned "No function found at 'Topic'" since it's a class, not a function) — relied on usage patterns to confirm the constructor call is correct. Could not assess how `explore` processes `kind="file"` topics downstream, which would confirm end-to-end correctness of the new file topic flow.

---

### FEATURE_REQUESTS
- Include dataclass/class definitions in observations, not just functions — the `Topic` class observation failed because the observer only looks for functions
- Show downstream consumers of queued topics (e.g., what processes `kind="file"` topics) to verify end-to-end integration
- Flag when test_count is 0 for modified files more prominently in the observation summary
