Various execution engine fixes#2103
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- core: add ObjectPath::fromString / findObject, reuse in remote control
- js: add Score.cable, path/findByPath, cable removal, setAutoTrigger/setProcessLoop
- gfx: clear image inputs with no incoming edge each frame
- gfx: don't return a half-initialized render state when QRhi::create fails
- gfx: fall back to a null RHI in output nodes when there is no GPU
- core: disconnect devices before tearing down documents
- gfx: release the static Vulkan instance when creation fails
- gstreamer: classify appsinks from the pipeline string, follow the engine quantum
- scenario: start processes added while the interval is already executing
- exec: set buffer size before begin_tick
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buildPipeline returns a null pipeline when QRhiGraphicsPipeline::create() fails (transient during graph rebuild). InvertYRenderer::finishFrame dereferenced it via setGraphicsPipeline (Q_ASSERT/null-deref), and quadRenderPass asserted on the then-missing pass. Both now skip the draw, matching defaultRenderPass / the if(pip.pipeline) guard at pass creation.
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