v0.3.0

Added

• Added projection-backed run timeline inspection for operator-facing run history.
• Added runtime spec preview execution for visual editors and draft workflow validation.
• Added guardrail validator registries for host-approved input, action, and output guardrails on runtime-authored specs.
• Added structural quality gates to the release and CI verification surface.

Changed

• Runtime journal execution now persists completed guardrail decisions so inspection and explanations keep showing applied guardrail outcomes.
• Runtime journal modules were reorganized around entry builders, options, dispatch scheduling, workflow definition loading, and explicit runtime contexts.
• Usage rules and workflow-authoring docs now describe guardrail registry and runtime spec preview behavior.

Fixed

• Runtime spec validation now rejects incompatible guardrail policy and placement combinations before activation.
• Guardrail config validation now rejects malformed config instead of silently coercing it to an empty map.
• Preview guardrail evaluation now uses the same step index semantics as runtime execution.