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New files: - Documentation/Authentication/Overview.md — all 7 auth mechanisms with real source snippets (NKey/JWT/username-password/token/TLS mapping), nonce generation, account system, permissions, JWT permission templates - Documentation/Clustering/Overview.md — route TCP handshake, in-process subscription propagation, gateway/leaf node stubs, honest gaps list - Documentation/JetStream/Overview.md — API surface (4 handled subjects), streams, consumers, storage (MemStore/FileStore), in-process RAFT, mirror/source, gaps list - Documentation/Monitoring/Overview.md — all 12 endpoints with real field tables, Go compatibility notes Updated files: - GettingStarted/Architecture.md — 14-subdirectory tree, real NatsClient/NatsServer field snippets, 9 new Go reference rows, Channel write queue design choice - GettingStarted/Setup.md — xUnit 3, 100 test files grouped by area - Operations/Overview.md — 99 test files, accurate Program.cs snippet, limitations section renamed to "Known Gaps vs Go Reference" with 7 real gaps - Server/Overview.md — grouped fields, TLS/WS accept path, lame-duck mode, POSIX signals - Configuration/Overview.md — 14 subsystem option tables, 24-row CLI table, LogOverrides - Server/Client.md — Channel write queue, 4-task RunAsync, CommandMatrix, real fields All docs verified against codebase 2026-02-23; 713 tests pass.