JuceFxLoop them thread ctrlReader poll 2ms: doc FxCtrlCmd ring (key 'ed.open'/
'ed.close'/'ed.show'/'ed.hide'/'ed.resize'/'ed.capture', slot = chain index), dispatch
qua engine.requestEditor (queue thread-safe; GUI tick 30ms pump). w/h ma hoa
trong value: w*4096+h (chinh xac tuyet doi w,h<=4095 — float 24-bit mantissa);
value<=0 -> editor preferred size. SET_PARAM cu (key khac) consume + bo qua an
toan (JuceFxEngine chua co param API — params di trong chain JSON). ctrl.join()
truoc shutdown. E2E test (session SHM that + bridge that, chain purecomp):
ed.open -> window native hien, audio pump khi GUI mo (process+editor song song),
hide/show/resize/capture 4049 bytes, close -> window bien mat, teardown sach
rc=0 — PASS 11/11. Tien de M4 (engine send_editor_cmd + /fx-gui).
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