release: finalize 1.0.0 cluster convergence gate

[SunSi12138]

Summary

• allow the static-cluster expansion integration test to converge on loaded Linux runners
• preserve the exact configured-budget assertion and add observed-count diagnostics
• make no production or package-content changes

Evidence

• local Integration Tests: 252/252 passed in three consecutive Release runs
• dev PR test: allow cluster expansion to converge #35 Quick and CodeQL: passed
• failed v1.0.0 tag attempt was withdrawn before GitHub Release or NuGet publication