v0.1.5

What's Changed

• Revert Tier 4a milestones 3 and 4 (#141, #142) — Sens path didn't deliver wall-time by @roninsightrx in #145
• perf(ode): FSAL stage reuse in DP-RK45 (~11% wall on FOCEI ODE fits) by @roninsightrx in #146
• perf(estimation): bump saem_n_mh_steps default 3 → 10 to escape Emax PKPD cold-start basin by @roninsightrx in #148
• perf(estimation): switch SAEM M-step from SLSQP to BOBYQA — escapes Emax-Hill identifiability ridge by @roninsightrx in #151
• docs(estimation): scope optimizer to FOCE/FOCEI + GN-hybrid polish by @roninsightrx in #153
• fix(estimation): regularize FD Hessian before covariance inversion [closes #129] by @roninsightrx in #154
• feat(estimation): switch default outer optimizer from SLSQP to BOBYQA by @roninsightrx in #155
• fix(tests): re-anchor GN-TR baselines to Almquist Laplace minimum [closes #144] by @roninsightrx in #156
• fix(tests): re-anchor SAEM & stagnation-guard slow tests after recent improvements by @roninsightrx in #157
• feat(types): add structured WarningEntry with severity/category to FitResult by @TeunP in #152
• test(types): round-trip every engine warning message through classify_warning by @TeunP in #158
• fix(api): error early when IOV model has no occasion labels in dataset by @TeunP in #159
• fix(parser): classify IIV+IOV and derived-base etas as log-normal [closes ferx-r#55] by @TeunP in #161
• fix(tests): widen IOV cold-start SLSQP tolerance + run all slow-test binaries by @roninsightrx in #162
• feat(parser): flexible FIX placement for omega, sigma, kappa, and theta by @TeunP in #165
• feat(parser): warn on declared-but-unused parameters by @TeunP in #166
• feat(api): compute kappa shrinkage for IOV models by @TeunP in #167
• fix(tests): relax iov_chain SAEM-improvement floor + fix nca_sweep fixture by @roninsightrx in #164
• chore: add CodeFactor badge to README by @roninsightrx in #168
• test(suggest_start): cover sweep.rs uncovered branches + count integration tests in coverage by @roninsightrx in #169

Full Changelog: v0.1.0...v0.1.5