- Updated README.md with comprehensive documentation for new features:
  * User-Specific API Endpoints with Bearer token authentication
  * Adaptive Rate Limiting with learning from 429 responses
  * Model Metadata Extraction with automatic pricing/rate limit detection
  * Enhanced Analytics Filtering by provider/model/rotation
  * Updated Web Dashboard feature list

- Updated DOCUMENTATION.md with detailed sections:
  * Adaptive Rate Limiting configuration and benefits
  * Model Metadata Extraction features and dashboard integration

- Updated CHANGELOG.md:
  * Moved Unreleased section to version 0.9.2 (2026-04-03)
  * Added comprehensive list of new features and changes

- Version bump to 0.9.2:
  * Updated pyproject.toml version
  * Updated aisbf/__init__.py version

This release focuses on improving documentation coverage for recently
added features including user-specific API endpoints, adaptive rate
limiting, model metadata extraction, and analytics filtering.