Decompose architecture into 35 atomic tasks across 10 generations for implementation

tasks/napi/serve-function.md

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+---
+id: napi/serve-function
+name: Implement NAPI serve() — server with connection events returning Duplex streams
+status: pending
+depends_on:
+  - napi/project-setup
+  - server/serve-loop
+scope: moderate
+risk: high
+impact: component
+level: implementation
+---
+
+## Description
+
+Implement the NAPI `serve()` function per ADR-016. Returns a `WraithServer` object with a `close()` method and `onConnection` event emitter. Each incoming SSH connection produces a `Duplex` stream.
+
+The function accepts `WraithServeOptions` and returns `Promise<WraithServer>`. The NAPI layer handles transport binding, SSH server setup, and connection handling.
+
+## Acceptance Criteria
+
+- [ ] `#[napi]` function `serve(options: WraithServeOptions) -> Result<WraithServer>` in `crates/wraith-napi/src/serve.rs`
+- [ ] `WraithServeOptions` struct with napi fields: `transport`, `hostKey`, `authorizedKeys`, `certAuthority`, `tlsCert`, `tlsKey`, `acmeDomain`, `listen`, `irohRelay`
+- [ ] `WraithServer` napi class with `close() -> Promise<void>` and `onConnection(callback)` event registration
+- [ ] Each incoming connection produces a `Duplex` stream via the `onConnection` callback
+- [ ] `ConnectionInfo` struct passed with each connection: `remoteAddr`, `transportKind`
+- [ ] Key material: `hostKey`, `authorizedKeys` accept file path (string) or `Buffer` (in-memory)
+- [ ] Server starts transport acceptor, authenticates connections, emits stream events
+- [ ] `close()` triggers graceful shutdown
+- [ ] TypeScript type matches napi-and-pubsub.md spec
+- [ ] Integration test: JS serve() + connect() round-trip works
+
+## References
+
+- docs/architecture/napi-and-pubsub.md — NAPI serve() spec, WraithServer interface
+- docs/architecture/decisions/016-napi-expose-connect-and-serve.md — both connect() and serve()
+- docs/architecture/server.md — server configuration
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion