0.1.0a14

Added

• Bpod publishes live trial events over the PUB/SUB channel as a tagged union of
  typed messages.
• RemoteBpod accepts an event_callback that receives each live trial-event
  message.
• ServiceHost.get_metadata for accessing per-request connection metadata from within
  a request handler.
• ServiceHost.publish for broadcasting events over the PUB/SUB channel;
  ServiceClient decodes them per its new event_type parameter.
• ServiceHost remembers the TCP ports last bound for a caller-supplied uuid
  (stored in the user state directory) and reuses them on restart; explicit
  port_rep / port_pub arguments take precedence.
  ServiceHost.has_subscribers: the host tracks PUB/SUB subscriptions and
  publish drops messages before encoding while nobody is listening.
• ServiceClient.request accepts an optional timeout; the client recovers cleanly
  after a timed-out request.

Changed

• Add UTC timezone to trial DataFrame timestamps.
• ServiceClient adopts the host's serialization format during the
  handshake, replacing the per-request trial-and-error fallback.
• the WELCOME handshake carries the PUB channel's TCP port instead of full TCP
  addresses.
• errors raised by bpod_core.ipc are now uniformly ServiceError subclasses
• remote method calls (BpodRequestCall / BpodRequestData) are validated against
  an explicit allowlist instead of dispatching to arbitrary attributes.

Fixed

• ServiceClient no longer blocks indefinitely when the host dies mid-request.
• exceptions with non-serializable attributes no longer break error replies from
  ServiceHost.
• resolved several shutdown races between close() and the event threads / publish().
• ServiceIterator.close() now terminates an iteration blocked in __next__
  (e.g., with timeout=None) instead of leaving the consumer waiting forever.

Full Changelog: 0.1.0a13...0.1.0a14