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docs/ARCHITECTURE.md (531 lines): System design, ASCII diagrams, crypto stack, dual-curve identity, wire protocol (7 WireMessage variants), server/client architecture, data flow diagrams, storage model, extensibility points docs/USAGE.md (550 lines): Complete user guide: installation, all CLI commands (10), all TUI commands (20+), all web commands, file transfer, identity management, aliases, groups, multi-device, backup, keyboard shortcuts docs/INTEGRATION.md (542 lines): WarzonePhone concept, Ethereum/Web3, OIDC, DNS federation, transport abstraction, multi-server mode, custom clients, ntfy, how-to guides for extending message types/commands/storage docs/PROGRESS.md (234 lines): Timeline, Phase 1 (16 features), Phase 2 (16 features), v0.0.20, 28 tests, bugs fixed, known limitations, Phase 3-7 roadmap docs/SECURITY.md (438 lines): Threat model, 8 crypto primitives, key derivation paths, forward secrecy, Sender Keys trade-offs, seed security, server trust, WASM security, known weaknesses, comparison with Signal/Matrix/SimpleX Total: 3,751 lines across 8 doc files. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>