test: add prefix-causality tests for HMM and BOCPD - #7
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Research claim
This PR adds explicit prefix-causality tests for the HMM filter and BOCPD change probability functions, as requested in #4.
Primary reference and causal boundary
Falsification design
The test compares the output of the functions on a full series with the output on its prefixes. If the function is causal, the prefix output must be identical to the corresponding part of the full output.
Output role
Validation tool / Test suite.
Non-claims
This PR does not change the underlying algorithms, only adds verification for their causal properties.