feat: record human play and replay input movies

[AloysHF]

Summary

Record human play as a plain-text input movie, then replay it headlessly to produce a playthrough video (optional frames + audio).

This PR is master + one focused commit. AI auto-play / assist / auto-clear code is not included.

How to use

Record while playing

Standalone (windowed):

native32-emu --record-input runs\clear.nmov path\to\game.smf

RetroArch core:

• Core Options → Record input movie (text) → enabled
  → <system>/Native32Emu/inputs/<content>-<timestamp>.nmov
• Or set env NATIVE32_RECORD_INPUT=D:\runs\clear.nmov before launch

Unload content / quit the emulator to finalize the movie.

Replay / encode video

powershell -File scripts\replay-movie.ps1 -Movie runs\clear.nmov

Direct CLI:

native32-emu --replay runs\clear.nmov `
  --dump-frames out\frames --dump-every 2 --record-audio out\audio.wav `
  path\to\game.smf

replay-movie.ps1 encodes replay.mp4 (H.264 + AAC) when FFmpeg is on PATH.

Movie format

Plain text .nmov (JSON if the path ends in .json):

# Native32 input movie v1
game: path/to/game.smf
fps: 30
auto_skip_cutscenes: true
# frame keys... [hold N]   keys: L R U D A B or 0xNNNN
0 hold 30
30 A hold 5
80 R A hold 15

Events are compressed key-change holds (readable and easy to hand-edit).

Changes

Area	Files
Core	movie.rs (format + recorder + live log), headless.rs (replay), audio capture for WAV during replay
Standalone	--record-input, --replay, --dump-frames, --dump-every, --record-audio, --max-frames
RetroArch	Core option native32emu_record_input, env NATIVE32_RECORD_INPUT
Scripts	scripts/replay-movie.ps1
Docs	docs/Input-Movies.md, CLI table in Standalone-Emulator.md

Checks

• cargo test --workspace
• cargo clippy --workspace --all-targets --all-features -- -D warnings
• Demo text movie replay produced video + audio locally

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.5% Duplication on New Code

See analysis details on SonarQube Cloud