750fada8f6
M6 deletes legacy floating chat entirely: - Frontend: FloatingChat / FloatingChatContext / useDoubleClickAI / all data-ai-section attrs / 'floating' from useAIChat / ChatInputBox / sendFloatingRequest / orchestrateFloating / ai.chat mode='floating' - TaskBriefChat migrated from mode='floating' to mode='contextual' - Backend: _handle_floating_request / run_floating_stream / _FLOATING_SYSTEM_PROMPT / floating tool helpers / WsFloatingRequest / WsFloatingDomain / StreamFormatter floating_domain branch / LLM_MODEL_FLOATING_AGENT / 'floating-agent' llm.py entry - Langfuse: 'floating_system' prompt deleted (4 versions, all labels) - Tests: floating-specific test functions removed from test_deep_agent.py + test_ws_unified.py + test_output_formatter.py + test_schemas_v3.py Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>