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 current/index snapshot of production, active milestones, decisions, blockers, and links to detail.
Verification status: demand-loaded ledger of current cross-cutting evidence, open proof boundaries, and expensive-test applicability.
Deployment: old production rollback boundary and the isolated self-hosted-STUN plus LiveKit-SFU/UDP candidate contract.
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: SFU-root/peer distribution, selected-edge TURN, hop-level accounting, privacy-safe ICE evidence, and bounded transport gates.
Built-in peer ICE TURN candidate: rejected canary record, retained standards/resource findings, and the selected-edge replacement boundary.
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 ladder, unclassified product-gate failure, staged revalidation, and stop line.
Native H.264 hardware decision: bounded WebCodecs no-go, proved Media Foundation/NVIDIA hardware encode, the default-fmtp 42c01f stop, and the retained interop boundary.
Native H.264 opt-in path: explicit H.264 sender mode, exact Pion profile registration, and one bounded Host/Viewer loopback with hardware caveats.
Realtime quality adaptation: correlated capture/send/receive diagnosis, production generation-rebuild gate, path-isolated 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.
Display name and presence boundaries: browser-local storage failure behavior, Unicode normalization, control-character policy, and the Web-only presence capability boundary.
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: site access, room-scoped private Viewer grants, explicit public-watch, rotation, and minimal SQLite persistence.
ADR-0004: proposed, experiment-only standard-WebRTC peer-assisted spike with hard fanout and failure gates.
ADR-0005: accepted direct/peer UDP -> SFU-root -> optional exceptional-edge TURN direction, including the historical room-1 smoke and broader migration gates.
ADR-0006: proposed fixed-HIGH native canary, current no-go result, and staged revalidation boundary.
ADR-0007: accepted path-isolated HIGH + at most one LOW policy, optional idle-layer stop, evidence contract, and SVC boundary.
ADR-0008: browser window-audio hint and the Windows WASAPI process-loopback 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.