feat: Implement Galaxy Core Architecture & Production Hardening

[badalraj9]

This PR implements the core Galaxy architecture, shifting from a single-collection memory model to a multi-agent universe model. It includes:

1. Galaxy Core (memory_thread/nervous/galaxy_core.py):

   • AgentMemorySpace: Manages per-agent fact/belief collections.
   • GalaxyBridge: Manages explicit links between beliefs (supports/contradicts).
   • GalaxyCore: Orchestrator for ingestion and querying across universes.

2. Auto-Bridge (memory_thread/nervous/auto_bridge.py):

   • Background service to automatically detect and link related beliefs using semantic search.

3. Conflict Resolution (memory_thread/nervous/conflict_resolution.py):

   • ConflictGraph: Graph representation of beliefs and relationships.
   • ConflictResolutionEngine: Strategies (Authority, Consensus) to resolve contradictions.

4. Production Hardening:

   • Backpressure: SlabAllocator now supports timeouts in reserve_slab.
   • Batching: PersistenceEngine now implements real batching logic (aggregating items before simulated write).
   • Graceful Shutdown: IngestionService now logs and manages shutdown sequence.

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PR created automatically by Jules for task 193945826299697218 started by @badalraj9

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