refactor(production): ModSharp house-style + AdminManager commands + zero Core commands + gamedata-resolved classification

Addresses ModSharp authors' critique. Core: zero commands (removed sp_dump/sp_field,
moved SerializerProbe to Example, dropped InterfaceBridge static-singleton + unused
members) — publishes ISendProxyManager only. Example: all commands via
IAdminCommandRegistry.RegisterAdminCommand under 'sendproxy:example' permission
(AdminManager, resolved in OAM/OnLibraryConnected), not raw CreateServerCommand.
Style: .editorconfig from modsharp-source, AGPL headers, file-scoped ns, braced
statements, #region, comment density 26%->6% (kept RE offset notes). Heuristic
reduction: encoder classification via gamedata-resolved bucket bases (EncoderBucketN
= EncoderRegistry + factory '+{b*16} d') instead of the in-C# registry walk; Classify
= dict lookup. Engine behavior unchanged. Build 0/0 (3 projects). Verify audit: all PASS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>