fix(pipe): prevent error swallowing and goroutine leak in Pipe/Transport

Pipe: remove context.WithCancel that caused premature ctx.Done()
before the second pipeHalf could return its error. Replace with a
completed counter that drains both errors even on cancellation.

Transport: increase error channel buffer from 1 to 2 to prevent
goroutine leak when both CopyBuffer goroutines complete.

README.md

@@ -1,3 +1,33 @@
-# The extended (may be experimental) features outside the main gost tree.
+# x
 
+The implementation layer for the GOST proxy framework. Every interface defined in [core/](../core/) is implemented here — handlers, listeners, dialers, connectors, plus config parsing, registries, and all cross-cutting concerns.
 
+## Package layout
+
+| Directory | Purpose |
+|-----------|---------|
+| `handler/` | Protocol handlers (http, socks4/5, ss, ssh, tunnel, tun, dns, redirect, etc.) |
+| `listener/` | Protocol listeners (tcp, tls, ws, http2/3, quic, kcp, icmp, tun, udp, etc.) |
+| `dialer/` | Outbound dialers (tcp, tls, ws, http2/3, quic, grpc, ssh, wg, kcp, icmp, etc.) |
+| `connector/` | Destination connectors (http, socks4/5, ss, ssh, relay, tunnel, direct, etc.) |
+| `config/` | Config struct, YAML/JSON parsing, and service construction |
+| `registry/` | Typed global registries for all component types |
+| `service/` | Accept loop wiring listener + handler |
+| `chain/` | Multi-hop forwarding chain and route implementation |
+| `router/` | Route table router (destination-based routing) |
+| `hop/` | Node group with load-balanced selection |
+| `selector/` | Load-balancing strategies (round-robin, random, weighted, hash) |
+| `auth/`, `bypass/`, `admission/` | Authentication, bypass rules, admission control |
+| `resolver/`, `hosts/` | DNS resolution and host mapping |
+| `limiter/` | Traffic, connection, and rate limiters |
+| `recorder/`, `observer/` | Traffic recording and observability |
+| `ingress/`, `sd/`, `routing/` | Ingress control, service discovery, routing rules |
+| `logger/`, `metrics/`, `api/` | Logging, Prometheus metrics, Web API |
+| `metadata/`, `ctx/` | Metadata key-value system and context propagation |
+| `internal/` | Shared internals — not importable externally |
+
+## Component pattern
+
+Every handler, listener, dialer, and connector follows the same pattern: `init()` registers a constructor into a global registry, the constructor takes functional options, and `Init(metadata.Metadata)` extracts typed configuration from the metadata key-value map.
+
+See [CLAUDE.md](CLAUDE.md) for detailed architecture and conventions.