chore: sync multi-repo dev layout

release_notes/RELEASE_v0.8.892.md

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+# Release v0.8.892 — Phase 925
+
+Dual-stack bridge removal: `PEARCORD_RPC_WIRE=dual|both` resolves to v2-only gossip (no parallel v1 leg). v1 gossip opt-out retained until Phase 926.
+
+- `rpc-wire-env.js` — dual/both aliases map to `v2`; `isRpcWireV1`/`isRpcWireV2` no longer treat dual as both stacks
+- `smoke-protomux-rpc-dual-stack.cjs` — verifies dual alias v2 gossip
+- CI: `npm run test:ci-phase925`

release_notes/RELEASE_v0.8.893.md

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+# Release v0.8.893 — Phase 926
+
+P867-50 complete: legacy `encodeRpc` gossip paths removed; gossip wire is v2-only. Direct `protomux`/`protomux-rpc` deps trimmed from `apps/pearcord/package.json` (retained in `pearcord-drive`).
+
+- `mux-wire/gossip.js` — v2-only `attachGossipWireSession` + `broadcastGossipToSessions`
+- `rpc-wire-env.js` — `getRpcWireMode()` always `v2`
+- CI: `npm run test:ci-phase926`