- Add shared executor model pair resolution in task executor and step-session executor to apply lane hierarchy consistently
- Prefer project defaultProviderOverride/defaultModelIdOverride before global defaults when execution lanes are unset
- Update hot-swap model resolution to use the same precedence logic as runtime session creation
- Add regression tests for runtime, hot-swap, and step-session precedence/fallback behavior
- Add a changeset for @runfusion/fusion describing the executor model precedence fix
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