Add peripheral — own-core, consent-gated I/O organ

939-line Swift I/O organ (mic/camera capture, speaker playback via
AVFoundation/CoreAudio), own-core LPC voice synthesis/imitation,
consent-gating, and full-duplex barge-in conversation — closing the
hear -> understand -> speak loop entirely on-device.

.gitignore in this dir already excludes bin/ (build output), out/
(captured media), and .consent.json/.resume.json (local runtime state),
so only src + README + .gitignore are committed here.

peripheral/.gitignore

@@ -0,0 +1,8 @@
+# Build + runtime artifacts — never committed.
+bin/
+# Captured media (camera frames, mic audio) and syntheses. Raw streams stay
+# LOCAL and never egress — including into git.
+out/
+# Runtime consent + resume state (local, per-machine).
+.consent.json
+.resume.json