Extend the Runtime 3 IR spec with a standalone 'condition' action
kind that takes {expr, then[], else[]} sublists, keeping branching
local to the current step (no extra transitions or step duplication).
The validator now accepts both string-form (legacy firmware import)
and dict-form actions, recursively validating condition.then /
condition.else as nested action lists. STANDARD_ACTION_KINDS gains
the full set of blocks_studio kinds (audio, LCD, hardware, ESP-NOW,
BOX-3, M5, PLIP) so the blocks-to-IR codec output passes validation
end-to-end.
L'électron rare
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