Brings the Claude PHP SDK to full functional parity with the Python Anthropic
SDK from v0.83.0 (Feb 19, 2026) through v0.96.0 (Apr 16, 2026).

Highlights:
- Claude Managed Agents (Agents, Sessions, Vaults, Environments, User Profiles)
- Bedrock Mantle client + AWS SigV4 signing (no aws-sdk-php required)
- Vertex US/EU/global multi-region routing
- Filesystem memory tool with path-traversal protection
- MCP conversion helpers
- Beta advisor tool, token budgets, structured stop_details
- Top-level cache_control, adaptive thinking display
- claude-opus-4-7 and claude-mythos-preview models
- Full async support including nested sub-resources
- 424 tests passing

See CHANGELOG.md for the complete list of changes.