raeperd / stepdown / 23952800403

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Add circular call detection (#15)

* Add circular call detection to suppress false positives

Build per-file call graph and DFS reachability check before reporting.
Skip closures when building call graph to avoid false circular edges.
Move helper functions (reachable, recvTypeName) above run for top-down order.

Closes #6

* Fix self-lint: move helpers after run (caller before callee)

The stepdown rule requires callers above callees. run() calls
reachable() and recvTypeName(), so run must be declared first.

50 of 57 new or added lines in 1 file covered. (87.72%)

144 of 162 relevant lines covered (88.89%)

169.67 hits per line