v0.1.5 — robustness + audit-5 cleanup

[0.1.5] — 2026-05-26

Fixed

• regrid_response(em) on a Gaussian-identity GLM is now a
  no-op (was: raised ValueError: No transform recognised). The
  identity-link path now resolves to make_tran("identity")
  instead of routing through detect_transform("y"), which only
  recognises function-call shapes. Matches R emmeans::regrid
  on glm(y ~ x, family=gaussian()).
• Cox PH baseline-unidentified warning now also detects the
  Cox model when it appears as info.raw_result.model.__class__,
  not only as info.raw_result.__class__. Wrapped result objects
  (e.g. MI-pooled, custom proxies) now trigger the warning as
  intended. Plain PHRegResults behaviour is unchanged.
• Three tests now pass under pytest -W error (strict CI):
  test_response_for_ols_is_noop, test_response_scale_binomial_in_unit_interval,
  and test_pbmodcomp_bootstrap_more_conservative_in_small_sample
  each carry a @pytest.mark.filterwarnings(...) decorator for
  the warning the test legitimately expects.
• qdrg("~ x", ...) (R-style RHS-only formula with leading
  tilde) is now accepted alongside the existing "x" and
  "y ~ x" forms.

Fixed (documentation)

• README banner version: (v0.1.3) → (v0.1.5) (banner was
  unchanged across 0.1.3 → 0.1.4 → 0.1.5).
• docs/index.md and docs/PERFORMANCE_REPORT.md version stamps
  synced to 0.1.5.
• README and docs/r_parity_matrix.md test count: 312 → 313
  (measured with the [parallel,plot,tutorial] extras installed,
  which include the optional linearmodels / joblib tests).
• docs/PERFORMANCE_REPORT.md speedup arithmetic corrected on
  four rows: 13.7x → 11.5x (n=1000), 8.1x → 7.5x (n=10000 and
  n=100000), 7.6x → 7.7x (n=500000). Underlying timings
  unchanged; the displayed ratios now match R_time / pymmeans_time
  exactly.