Scaffold local OBS streaming bridge

docs/implementation-plan.md

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+# Implementation Plan
+
+## Implemented
+
+- Repo-local persistence machinery.
+- First architecture map.
+- Example config for one video source plus two audio sources.
+- Sender device discovery script.
+- Sender launch script with dry-run mode and per-source FFmpeg commands.
+- OBS receiver setup notes.
+
+## Temporary
+
+- Audio and video are separate SRT endpoints. This preserves OBS mixing authority but may need latency tuning.
+- Audio defaults to AAC inside MPEG-TS for compatibility; test Opus later only if there is a concrete reason.
+- Desktop capture uses `gdigrab` first because it is broadly available. `ddagrab` is a candidate once the installed FFmpeg build is confirmed.
+- The scripts assume Windows sender and OBS receiver on the same LAN.
+
+## Next
+
+1. Run `scripts/sender-discover.ps1` on the sender and record the actual device names.
+2. Smoke-test one video stream into OBS.
+3. Smoke-test each audio source independently.
+4. Tune SRT latency and FFmpeg buffering for the local network.
+5. Decide whether a small OBS scene/source generator is worth adding.
+6. Reconsider plugin/fork only if standard OBS Media Source cannot preserve the required behavior.