Retire legacy implementations and flatten managed layout

docs/README.md

@@ -2,37 +2,26 @@
 
 VoiceCat is a self-hosted channel-based voice and text system. Control traffic uses TLS 1.3;
 media uses authenticated encrypted UDP derived from the TLS session. There is no plaintext
-mode and no central service.
+mode or central service.
 
-The .NET 10 implementation is the source of truth. Some detailed documents predate the managed
-rewrite and are being corrected as code changes touch them. When prose conflicts with current
-managed code or tests, follow the managed implementation and fix the document in the same
-change.
-
-## Current documents
+Current references:
 
 - [architecture.md](architecture.md) — components, ownership, concurrency, and native boundary.
-- [protocol.md](protocol.md) — protobuf control messages and fixed UDP media header.
-- [security.md](security.md) — TLS, TOFU, media keys, authentication, and threat model.
-- [voice.md](voice.md) — streams, Opus, loss handling, jitter, mixing, and screen audio.
-- [api-dotnet.md](api-dotnet.md) — managed APIs and ownership contracts.
+- [api-dotnet.md](api-dotnet.md) — managed API and ownership contracts.
 - [building.md](building.md) — development, platform builds, tests, and publishing.
-- [deployment.md](deployment.md) — server configuration and packaging.
-- [ios-deploy.md](ios-deploy.md) — managed iOS physical-device build and deployment.
+- [deployment.md](deployment.md) — server packaging and operations.
+- [ios-deploy.md](ios-deploy.md) — physical-device iOS build and deployment.
 - [tech-stack.md](tech-stack.md) — supported dependencies and licensing.
-- [broadcast-ring-format.md](broadcast-ring-format.md) — frozen iOS extension/host ring ABI.
-- [roadmap.md](roadmap.md) — only current release gates and intentionally deferred features.
+- [broadcast-ring-format.md](broadcast-ring-format.md) — frozen extension/host ring ABI.
 
-The completed C++-to-.NET migration plan was removed. Git history preserves that work without
-making every future agent load an obsolete implementation diary.
+`proto/voicecat.proto` is the control-plane wire contract. Managed tests are the executable
+behavior contract. Keep prose current with those sources rather than documenting historical
+implementations.
 
-## Durable rules
+Durable rules:
 
-- `proto/voicecat.proto` is the control-plane schema.
 - Encryption is mandatory.
-- No GPL or LGPL dependencies.
+- GPL and LGPL dependencies are forbidden.
 - Real-time audio callbacks never allocate, lock, block, or perform I/O.
-- The server relays encoded media; it does not mix or transcode.
-- Text is ephemeral in v1.
-- Accounts are administrator-provisioned; guests are an operator choice.
+- The server relays encoded media; it does not mix or transcode it.
 - Wire, database, and shared-ring changes are explicitly versioned.