需求理解: current product scope, priorities, constraints, and acceptance criteria.
方案设计: accepted, code-ready design for the first measurable WebRTC proof of concept.
Project memory: durable decisions and unresolved questions to read at the start of future work.
Current status: bounded snapshot of the current phase, completed baseline, next step, and blockers.
Deployment: minimal Node, HTTPS/WSS, coturn, firewall, secret, optional TURN/TLS, and network-verification procedure.
Maintenance guide: Git workflow, context hygiene, document lifecycle, research policy, and automation.
P2P WebRTC research: evidence, bandwidth model, browser constraints, reference implementations, and feasibility assessment.
Peer-assisted media research: browser shared-encode limits, standard relay re-encoding, deterministic sticky topology, runtime relay-capacity extension, and abandon gates.
Low-server-cost media routes: per-edge TURN versus SFU-root topology, hop-level traffic accounting, privacy-safe ICE evidence, dual-TURN shadow gates, and failure-only final fallback.
Advanced peer distribution: multi-tree/SVC, encoded-object relay, native RTP forwarding, FEC/network-coding, MoQ, and measurable go/no-go gates.
Native shared-encode sender: consolidated Draft #16/#18/#22/#23/#25/#28 evidence ladder, current Pion/WebCodecs verdicts, and product stop line.
Realtime quality adaptation: correlated capture/send/receive diagnosis, production generation-rebuild gate, demand-driven dual representations, and bounded simulcast/Dynacast/SVC checks.
Browser screen-audio quality: capture/source compatibility, standard readback limits, Opus negotiation boundaries, and the retained no-control decision.
Agent context governance research: official Codex, Claude Code, Hermes Agent, and GitHub practices adopted by this repository.
ADR-0001: accepted P2P-first media topology and its consequences.
ADR-0002: optional SQLite persistence, protected sequential room IDs, and room lifecycle.
ADR-0004: proposed, experiment-only standard-WebRTC peer-assisted spike with hard fanout and failure gates.
ADR-0005: proposed, default-off automatic P2P/peer/SFU preparation, token-free standby prewarm, commit, failback, and rollback with a hard host-edge budget.
ADR-0007: accepted demand-driven HIGH + at most one on-demand LOW quality policy, path-level hysteresis, evidence contract, and SVC boundary.

Documentation and project memory are part of the product source of truth. Update them in the same change that alters the corresponding requirement or architecture.