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docs/architecture.md: layering, service map, event taxonomy, the session/turn/step lifecycle, Cordis waterfall semantics, an extension cookbook, the plugin sanity checklist mapping every MVP feature to its extension mechanism, and the deferred-work TODO list (sub-agents, persistence backends, compaction, DeepSeek V4 adapter, parallel tool execution, streaming-protocol review). AGENTS.md: repo layout, commands, conventions (dsh-* naming, ESM, effect-based registrations, declaration merging, waterfall semantics), and the vendoring policy pointer.