fix(trace-opencode): lazy-init SessionState in chat.message for API-created sessions#5

ekeith (evanmkeith) wants to merge 1 commit intomainbraintrustdata/braintrust-opencode-plugin:mainfrom

04-06-fix(trace-opencode)-lazy-init-session-state-for-API-created-sessionsbraintrustdata/braintrust-opencode-plugin:04-06-fix(trace-opencode)-lazy-init-session-state-for-API-created-sessionsCopy head branch name to clipboard