Wire reconciler and ingest into video node

Each ingest stream gets two reconciler resources (device, transport) with
dependencies: transport waits for device OPEN (needs format for STREAM_OPEN),
device waits for transport CONNECTED before starting capture.

START_INGEST sets wanted state and triggers a tick; the reconciler drives
device CLOSED→OPEN→STREAMING and transport DISCONNECTED→CONNECTED over
subsequent ticks. STOP_INGEST reverses both.

External events (transport drop, ingest thread error) use
reconciler_force_current to push state backward; the periodic 500ms timer
thread re-drives toward wanted state automatically.

All 8 stream slots are pre-allocated at startup. on_ingest_frame sends
VIDEO_FRAME messages over the outbound transport connection, protected by
a per-stream conn_mutex.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

include/reconciler.h

@@ -85,6 +85,15 @@ void reconciler_add_dep(
 	int                  dep_min_state);
 
 void        reconciler_set_wanted(struct Rec_Resource *r, int wanted_state);
+
+/*
+ * Force current state without executing a transition.
+ * Use when an external event pushes a resource into a new state —
+ * e.g. a transport connection drops unexpectedly, or a device error
+ * causes the capture thread to exit. The reconciler will drive back
+ * toward wanted state on the next tick.
+ */
+void        reconciler_force_current(struct Rec_Resource *r, int state);
 int         reconciler_get_current(const struct Rec_Resource *r);
 int         reconciler_get_wanted(const struct Rec_Resource *r);
 const char *reconciler_get_name(const struct Rec_Resource *r);