[M1] AI Query Optimizer: inverted index + bloom filter engine

[Fosurero]

Description

Implement QueryOptimizer with pre-indexed search for method names, event logs, and AI-agent intent patterns.

Tasks

• Inverted index for method names
• Event log tokenisation and indexing
• Bloom filter for fast negative checks (FNV-1a, 64K bits)
• Regex-based query support
• Temporal query filtering (block-height window)
• Vanilla baseline scan for benchmarking
• Unit tests (4 tests)

Status: ✅ Complete – M1 PoC