feat(media): introduce MediaRouter and stubs for image and speech generation

Merge remote-tracking branch 'origin/main' into worktree-scenarios

feat: make every scenario arena-grade with a competition contract

feat: Implement well-known typed fields for verdicts in output models

feat: implement per-event model attribution for enhanced event tracking

feat: update agent personas and scheduling in YAML configurations; enhance event handling and memory deduplication in core logic

feat(observability): instrument models, conductor, memory, ledger (Units 2-6)

feat: implement streaming agent responses and enhance conversation flow with repeat guards

Merge branch 'feat/live-open-table' into feat/live-integration

feat: add Open Table live-chat scenario (curious/skeptic/host)

feat: add the-steeped spy-game scenario (word-pair bluff)

feat: add Fishbowl UI presenter layer and say-vs-think engine support

Refactor code structure for improved readability and maintainability

feat: scaffold hackathon agent theater