fix: snapshot _connection_listeners before dispatch, not the live dict

[Bre77]

Intent

• _update_connection_listeners() iterated self._connection_listeners.values() directly. A connection listener that calls get_vehicle() for an uncached VIN - e.g. an integration discovering a vehicle on reconnect - registers that vehicle's own connection listener from TeslemetryStreamVehicle.__init__, mutating _connection_listeners mid-iteration and raising RuntimeError: dictionary changed size during iteration, which interrupts connect()/disconnect notification delivery for every other listener still due to run.
  • Reproduced directly against _update_connection_listeners() before fixing, and via tests/test_stream_lifecycle.py's new test through the real connect() path.
• Fix: iterate a list(...) snapshot instead of the live dict view - the same fix listen() already applies to _listeners for the identical hazard (see AGENTS.md), just without the sort/ordering requirement, since connection listeners don't share a mutable event object to race over.
• tests/test_stream_lifecycle.py adds a case mirroring the existing _listeners mid-dispatch coverage: a connection listener discovering a vehicle mid-dispatch must not raise, and both the discovery and the new vehicle's own listener registration must still land correctly.

[chatgpt-codex-connector]

💡 Codex Review

python-teslemetry-stream/teslemetry_stream/vehicle.py

Lines 139 to 142 in 9fe8d47

	if req.status == 404:
	# No config exists for this vehicle yet - an authoritative
	# answer (empty), not a missing one.
	self._populated = True

Clear stale config when treating a 404 as authoritative

When a vehicle retained fields or preferTyped from before a disconnect and the reconnect-window REST fetch now returns 404 because that config was removed, this branch marks the record populated without clearing those stale values. add_field() or prefer_typed() can consequently treat the old value as current and return without sending the PATCH, leaving the requested telemetry configuration disabled indefinitely; reset both cached values to their no-config defaults before setting _populated.

AGENTS.md reference: AGENTS.md:L21-L21

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