fd193d6e8b
Brings the cross-stack interop results plan up to date with what's actually shipped: - Top-level scenario inventory table covering all 13 scenarios (I1–I11 + Rust↔Rust + Phase 4) with their committed branches. - Phase 3 section documenting I5 hot-swap, I9 packet loss, and I10 long broadcast — all landed on this branch. - I4 stereo (forward + reverse) and I8 SubscribeDrop documented under Phase 2.E follow-ups. - Phase 4 (browser harness) and Phase 5 (browser-only scenarios) status pulled out of the bottom-of-file deferred list and documented properly. - Stability section explaining the per-method relay reset + catalog retry fix for full-suite ordering flakes. - CI integration section noting the live hang-interop job. - Pending follow-ups list (framesPerGroup reconciliation, goAway production surface, post-reconnect listener cliff). No code change.