Decompose architecture into 35 atomic tasks across 10 generations for implementation

tasks/meta/transport-layer.md

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+---
+id: meta/transport-layer
+name: Complete transport layer — trait, TCP, TLS, iroh, ACME
+status: pending
+depends_on:
+  - transport/trait-and-types
+  - transport/tcp-transport
+  - transport/tls-transport
+  - transport/iroh-transport
+  - transport/acme-cert-provisioning
+scope: system
+risk: high
+impact: phase
+level: planning
+---
+
+## Description
+
+Meta task that clusters all transport module tasks. Once complete, the transport layer provides a clean `Transport`/`TransportAcceptor` abstraction with TCP, TLS (feature-gated), iroh (feature-gated), and ACME (feature-gated) implementations. All transports produce the `AsyncRead + AsyncWrite + Unpin + Send` streams that SSH consumes.
+
+## Acceptance Criteria
+
+- [ ] All transport tasks completed
+- [ ] `Transport` trait produces duplex streams consumed by `russh::connect_stream()` / `russh::run_stream()`
+- [ ] TCP, TLS, iroh transports all work end-to-end
+- [ ] ACME cert provisioning integrates with TLS acceptor
+- [ ] Feature flags correctly gate optional transports
+
+## References
+
+- docs/architecture/transport.md
+
+## Notes
+
+> To be filled by implementation agent
+
+## Summary
+
+> To be filled on completion