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Re-implements PR #2908's generalized multimodal support on the post-FSM main branch: - Audio input: detects WAV/MP3/OGG/FLAC via magic bytes, sends input_audio blocks to compatible providers, falls back to [audio: path] placeholder when unsupported. - Video input: sends video_url data-URI blocks to compatible providers, falls back to [video: path] placeholder. - InputLimitsConfig: count limits (images/audios/videos) and byte limits per media type. - AgentDefaults: pattern-matched vision_models, audio_models, video_models with supports_*() helpers. - Provider retry: strips all media types (image_url, input_audio, video_url) on non-transient errors and retries once. - Feishu: extracts media tags from post messages. - Anthropic & OpenAI Responses converters handle audio/video. Tests: 17 new multimodal tests + existing suite passes.