OmniRoute/changelog.d/fixes/11433-opencode-alias-collision.md

• fix(combos): the combo builder's precision-select, global-model-search, and manual-entry flows now serialize a model step's model string using the provider's already-computed routing-alias prefix (e.g. oc/) instead of rebuilding it from the raw canonical providerId, fixing the no-auth "OpenCode Free" provider (opencode) being routed to the unrelated paid "OpenCode Zen" provider (opencode-zen) because opencode doubles as a manual routing-prefix override (#11433).