test(config): reject unsupported bifactor JMLE during preflight

[seonghobae]

Fail-first slice for #643

Protected main at branch creation: 56967deceafeb7ecd0ff08a98f196282a6ec81a3.

The public FitConfig currently advertises both jmle and mmle for every VALID_MODELS identity, while BIFAC2PLM + jmle is not an implemented fitting path. This Draft adds only the smallest intentional RED at configuration validation:

• BIFAC2PLM + jmle must raise a bounded ValueError during FitConfig.validate() and identify mmle as the supported estimator;
• BIFAC2PLM + mmle remains valid.

The current protected implementation is expected to fail the first test because validation accepts the unsupported pair. Setup/import/fixture/changelog failures are not valid RED.

After exact-head CI proves that boundary, implement the narrowest compatibility policy in python/fast_mlsirm/config.py, add the complete current VALID_MODELS × VALID_ESTIMATORS compatibility matrix, remove or demote any normal-path late NotImplementedError, preserve all implemented JMLE/MMLE numerics, add authoritative changelog/doctoring, and run all required same-head gates. Do not widen into a new bifactor JMLE estimator, numerical formulas, dependencies/workflows, release/version work, or canonical #604 documentation.

Keep Draft until RED→GREEN history and current-head review/gates are complete. Advances #643.

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[seonghobae]

Superseded: BIFAC2PLM+JMLE fail-closed at FitConfig.validate restored on main via #713 (test_model_estimator_compatibility).