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The producer already supports `format: "png-sequence"` end-to-end (see RenderConfig in renderOrchestrator.ts), but the CLI's VALID_FORMAT validator rejects it before the flag reaches the producer. Surface it the same way `mov` and `webm` are surfaced. Behaviour: - `--format png-sequence` accepted alongside mp4/webm/mov. - Auto-output path uses no extension (FORMAT_EXT["png-sequence"] = "") since the producer treats outputPath as a directory of frame_NNNNNN.png. - `printRenderComplete` sums the contained file sizes when outputPath is a directory, instead of reporting the platform-dependent inode size. - DockerRenderOptions.format type extended; existing buildDockerRunArgs is unchanged because it forwards the string verbatim. Tests: - renderLocal forwards `format: "png-sequence"` to createRenderJob. - buildDockerRunArgs propagates `--format png-sequence` to the container. Docs: - Rendering guide: format flag table, format comparison table, new "PNG sequence (no encoding)" section, "How it works" extended. - CLI package docs: format flag table updated.