Spynel v0.12.15

Publication incomplete: release verification failed before native builds and npm publication. Native archives, checksums, and npm 0.12.15 are unavailable; use stable 0.12.14. The failed workflow is https://github.com/agent0ai/spynel/actions/runs/37329515982.

Codex model selection now offers explicit Normal alongside Fast and Inherit, with turn-local speed overrides. Completing selection from configuration returns to the refreshed saved model, reasoning effort, and speed; the malformed post-save controls and stale summary are fixed.

Includes configuration-flow and transport regressions plus updated capability documentation.