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Three new SX primitives wrapping Unix socket APIs:
- socket-connect host port → "sockN" (TCP client)
- socket-server ?host? port → "sockN" listening socket (SO_REUSEADDR, backlog 8)
- socket-accept server-chan → {:channel :host :port}
Sockets reuse the channel_table from Phase 5, so existing channel-read/
write/close/select all work on them. Host arg supports localhost,
0.0.0.0, IPv4 literal, or gethostbyname lookup.
Tcl `socket` command:
- socket host port → TCP client
- socket -server cb port → listening socket; auto-registers a fileevent
on the server channel that fires `_sock-do-accept SRV CB` per readable
event. _sock-do-accept (internal) accepts the pending client and calls
the user's callback as `cb client-chan host port`.
puts channel detection now also recognizes "sockN" prefix (was only
"fileN") and dispatches to channel-write.
+4 idiom tests: socket-server-fires-callback, socket-client-server-
roundtrip, socket-server-peer-host, socket-multiple-connections.
358/358 green.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>