Mutual recursion termination verification (#45)#177
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Verify decreases clauses across mutually recursive where-block function groups. Where-block functions now have their contracts verified (requires, ensures, decreases). The call walker tracks group names instead of a single function name, and cross-calls use the callee decreases expression and parameter types. Verification coverage: 96 T1, 3 T3, 99 total (97.0% static). Co-Authored-By: Claude <noreply@anthropic.invalid>
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Summary
Closes #45 — completes C8c (verification depth).
Test plan
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