chore: bump version to 1.2.0

Major release with comprehensive code consolidation and optimization:
- Extracted shared utilities (text_utils, storage_utils)
- Consolidated search validation into search_common module
- Extracted similarity functions into dedicated module
- Added batch storage operations
- Refactored large functions for better testability
- Fixed all type checking errors (pyright, mypy, ruff)
- Updated and regenerated documentation

No breaking changes - all existing imports continue to work.

Author: prefrontalsys

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "cortexgraph"
-version = "1.1.1"
+version = "1.2.0"
 description = "CortexGraph: Temporal memory management for AI assistants with human-like dynamics"
 readme = "README.md"
 requires-python = ">=3.10"