* fix: allow Linux interface discovery in embedded media service
* feat: expand local diagnostic reports
* research: validate independent Browser encoding producers
* feat: prototype Browser pool ownership and record remaining media gates
* feat: refine Browser shared encoders and native output reuse
* Refine carrier costs and simplify release entry points
* Close media phase and prepare piik design handoff
Embed STUN and SFU in the shared Go process, reuse native encoding pipelines with independent adaptation, and complete Client lifecycle, settings, diagnostics and packaging fixes. Retain standard Browser senders after measured encoded-reuse limitations.