feat: apply new agent naming standards

Expanding abbreviations to remove ambiguity, simplifying agent names to reduce repetition.

ref: N25B-257

src/control_backend/agents/bdi/__init__.py

@@ -0,0 +1,7 @@
+from .bdi_core_agent.bdi_core_agent import BDICoreAgent as BDICoreAgent
+from .belief_collector_agent.belief_collector_agent import (
+    BDIBeliefCollectorAgent as BDIBeliefCollectorAgent,
+)
+from .text_belief_extractor_agent.text_belief_extractor_agent import (
+    TextBeliefExtractorAgent as TextBeliefExtractorAgent,
+)