feat(websocket): WsTimeouts request extension for WS pump knobs (WS-17)

- WsTimeouts { idle, write } request extension mirrors ChannelsPolicy:
  a deployment layers it on a WS route (bare-registry routes included)
  to set the pump knobs per route
- precedence: extension present replaces the router state entirely;
  absent falls back to SessionState (adapter-configured idle) and the
  crate default write window — a Default impl never clobbers the
  adapter-configured idle knob
- upgrade.rs module + handler docs now state the real defaults for
  bare-registry routes (60 s idle + 60 s write, 64-session semaphore,
  handler-private WsSessions) and the extension surface
- split_ws_to_bytes_idle_with_write exposes the WS-18 write window to
  run_channels_session; acceptance test drives a bare-registry route
  with a 150 ms extension idle window (1001 eviction observed)

Verification: scripts/verify.sh OK (343 passed), test-support suite
ok, clippy -D warnings clean, fmt clean

src/websocket/mod.rs

@@ -13,9 +13,10 @@ pub mod byte_adapter;
 pub mod upgrade;
 
 pub use byte_adapter::{
-    split_ws_to_bytes, split_ws_to_bytes_idle, WsByteStream, WsPumps, DEFAULT_WS_IDLE_TIMEOUT,
-    DEFAULT_WS_WRITE_TIMEOUT, INBOUND_WS_FRAME_CAP, INBOUND_WS_MESSAGE_CAP, MAX_CHUNK_LEN,
-    PENDING_BUFFER_CAP, WS_GOING_AWAY, WS_MESSAGE_CAP, WS_PROTOCOL_ERROR,
+    split_ws_to_bytes, split_ws_to_bytes_idle, split_ws_to_bytes_idle_with_write, WsByteStream,
+    WsPumps, DEFAULT_WS_IDLE_TIMEOUT, DEFAULT_WS_WRITE_TIMEOUT, INBOUND_WS_FRAME_CAP,
+    INBOUND_WS_MESSAGE_CAP, MAX_CHUNK_LEN, PENDING_BUFFER_CAP, WS_GOING_AWAY, WS_MESSAGE_CAP,
+    WS_PROTOCOL_ERROR,
 };
 
 #[cfg(any(test, feature = "wss"))]
@@ -25,7 +26,7 @@ pub use byte_adapter::split_tungstenite_to_bytes;
 pub(crate) use upgrade::adapter_install_channel_zero;
 pub use upgrade::{
     run_channels_session, ws_bearer_auth, ws_upgrade_handler, ChannelsPolicy, SessionState,
-    WsSessions, DEFAULT_WS_MAX_SESSIONS,
+    WsSessions, WsTimeouts, DEFAULT_WS_MAX_SESSIONS,
 };
 
 #[cfg(any(test, feature = "test-support"))]