Maintainer edit for PR 4115: rebase onto origin/main and split gateway HTTP routing from token, media, and workspace services so WebSocketChannel depends on explicit gateway services instead of GatewayHTTPHandler internals.
Preserve file edit channel capabilities and restore tools.restrict_to_workspace wiring through ChannelManager.
- Use hmac.compare_digest for timing-safe static token comparison
- Add issued token capacity limit (_MAX_ISSUED_TOKENS=10000) with 429 response
- Use atomic pop in _take_issued_token_if_valid to eliminate TOCTOU window
- Enforce TLSv1.2 minimum version for SSL connections
- Extract _safe_send helper for consistent ConnectionClosed handling
- Move connection registration after ready send to prevent out-of-order delivery
- Add HTTP-level allow_from check and client_id truncation in process_request
- Make stop() idempotent with graceful shutdown error handling
- Normalize path via validator instead of leaving raw value
- Default websocket_requires_token to True for secure-by-default behavior
- Add integration tests and ws_test_client helper
- Refactor tests to use shared _ch factory and bus fixture
