feat(media): add bounded PCM capture, owned snapshots and A/V streaming

packages/audio/src/io/native_capture.hadded+13-0

Changes to packages/audio/src/io/native_capture.h

		@@ -0,0 +1,13 @@
	1	+/* Home ALSA capture bridge, MIT. Opaque system ABI; S16LE interleaved PCM. */
	2	+#ifndef HOME_NATIVE_CAPTURE_H
	3	+#define HOME_NATIVE_CAPTURE_H
	4	+#include <stdint.h>
	5	+typedef struct home_audio_capture home_audio_capture;
	6	+typedef struct { uint32_t sample_rate,channels,block_frames; } home_capture_config;
	7	+int home_audio_open(const home_capture_config *,const char *device,home_audio_capture **);
	8	+/* 0 success, 1 timeout, negative error. timestamp is first sample in CLOCK_BOOTTIME
	9	+ * ns. Anchored sample counting avoids scheduler jitter; measured error is returned.
	10	+ * XRUNs/disconnects or clock error >100 ms fail explicitly; no silent recovery. */
	11	+int home_audio_read(home_audio_capture *,uint8_t *,uint32_t capacity_frames,uint32_t timeout_ms,uint32_t *frames,uint64_t *timestamp_ns,int64_t *clock_error_ns);
	12	+void home_audio_close(home_audio_capture *);
	13	+#endif