vmec-jax v0.0.13

vmec-jax v0.0.13

This release closes the v0.0.13 performance, parity, packaging, and docs lanes.

User-facing changes

• Plain pip install vmec-jax now includes the plotting and Boozer-coordinate dependencies needed by the documented examples.
• The public API exports plot_wout, matching the README and API docs.
• Quickstart WOUT plotting examples now point at the tracked pressure fixture.
• GPU high-mode non-LASYM cases keep the precomputed tridiagonal preconditioner policy used by the primal solve through exact accepted-point replay.

Performance and correctness

• Exact accepted-point replay now records and reuses the preconditioner tridiagonal policy, including replay cache-key separation for different tridiagonal paths.
• Added coverage for high-mode non-LASYM precomputed-tridi propagation and equivalence.
• Verified that the experimental jax.lax.linalg.tridiagonal_solve path is not ready to promote as a default: it was slower on the QH warm-start GPU test.

Validation

• Local full fast coverage gate: 2196 passed, 20 skipped, 109 deselected, 1 xfailed, coverage 95.09%.
• Local full docs build passed with warnings as errors.
• Local package build and twine check passed.
• Local slow exact replay checks passed: 2 passed.
• Local VMEC2000 executable fast validation passed: 5 passed.
• Main CI for the release commit passed before tagging.

Known limitations

• Seed-robust QI for NFP=4 remains a research/optimization lane rather than a guaranteed arbitrary-seed workflow.
• Some external VMEC2000 parity rows remain optional, skipped, or xfailed where documented because they require external assets, mgrids, or unresolved near-zero LASYM-channel differences.
• Remaining performance work is concentrated in cold exact tape/forward-force cost, accepted-point tangent construction, scan-trial timing instrumentation, and GPU kernel/launch overhead for preconditioner application.