fix(exponential-distribution): correct sign in log-space pdf branch - #181
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The logarithmic branch used `+ rate * x` instead of `- rate * x`, causing log pdf to grow with x rather than decay. The correct identity is log pdf(x) = log(λ) − λx. Expanded the test suite to cover pdf (previously untested), log pdf (which directly exercises the fixed branch), boundary values at ±infinity, and precondition failure tests, aligning the suite with LogisticDistributionTests. Fixes: #175
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The logarithmic branch used
+ rate * xinstead of- rate * x, causing log pdf to grow with x rather than decay. The correct identity is log pdf(x) = log(λ) − λx.Expanded the test suite to cover pdf (previously untested), log pdf (which directly exercises the fixed branch), boundary values at ±infinity, and precondition failure tests, aligning the suite with LogisticDistributionTests.
Fixes: #175