control: video frame capture + deterministic input-movie replay

Two socket features for building reproducible showcase clips:

- record start <path> [everyN] / record stop: append the RGB888 framebuffer of
  each produced frame to a flat 'GBCV' capture file (downsample with everyN).
  tools/gbgif.py turns it into a GIF (or PNG frames). Capture is decoupled from
  wall-clock/turbo/frameskip, so timing is always correct.

- input play <path> [reset] / input stop: drive the joypad from a synthesized
  TAS-style movie (text: '<frames> [buttons...]' per line), frame-locked so
  replay is deterministic. 'reset' does an exact power-on (preserve cart
  ROM+SRAM, zero all other state) so a movie replays byte-identically -- verified
  by hashing two runs. tools/gbmovie.py is a Python builder for movies.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
index 541ce44..ecd818e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -137,7 +137,9 @@ int main(int argc, char **argv) {
 
         // Emulate a full frame, honoring debugger pause/step/breakpoints when
         // the control socket is active (otherwise a plain full frame).
+        control_input_frame(gb);    // drive input from a replay movie if playing
         control_run_frame(gb);
+        control_record_frame(gb);   // append to the video capture if recording
 
         // decide whether to draw this frame
         bool do_render = (since_render >= frameskip);