raeperd / stepdown / 23951662589

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Implement basic caller-before-callee detection (#9)

* RED→GREEN: detect basic caller-before-callee violations

Implement core stepdown rule: collect function declarations per file,
walk bodies for call expressions, report when callee is declared above caller.

* Add test cases for external calls, transitive and multiple callees

* Fix duplicate diagnostics and remove redundant fmt.Sprintf

Add seen-set per caller to prevent reporting the same callee multiple
times. Use pass.Reportf format args directly instead of wrapping in
fmt.Sprintf.

43 of 51 new or added lines in 1 file covered. (84.31%)

55 of 63 relevant lines covered (87.3%)

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