1.14.6

## What's Changed

### Features
- Enhance StdioTransport to prevent environment variable leakage
- Enhance planning configuration and observation handling
- Declare env_vars on DatabricksQueryTool
- Add Agent Control Plane docs

### Bug Fixes
- Fix structured output leaks in tool-calling loops
- Drop unroundtrippable callbacks and adapter state in checkpoint
- Serialize type[BaseModel] fields as JSON schema in checkpoint
- Avoid orphan task_started on resume scope restore
- Allow AgentExecutor to restore from checkpoint
- Correct mongodb typo to pymongo in package_dependencies

### Documentation
- Add ACP (Beta) docs navigation block to Agent Control Plane pages
- Remove consensual process references from processes page
- Restructure checkpointing page
- Document one-time admin package install step
- Migrate Secrets Manager / Workload Identity from replicated-config
- Remove {" "} JSX expressions breaking <Steps> render

### Refactoring
- Move Skills Repository to experimental + CREWAI_EXPERIMENTAL gate

## Contributors

@akaKuruma, @alex-clawd, @github-actions[bot], @greysonlalonde, @heitorado, @iris-clawd, @lorenzejay, @lucasgomide, @mattatcha, @thiagomoretto, @vinibrsl