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Claude Code v2.1.248 adds restricted mode and cross-session messaging

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Claude Code v2.1.248 introduces a new `--restricted` mode that removes built-in command execution tools and ignores user settings to enhance security. The update also adds cross-session messaging capabilities between sessions on the same machine across Bedrock, Vertex, and Foundry environments.

Added `--restricted` flag to disable code execution tools and bypass permissions.
Introduced `experimental.cacheTtl` for per-agent prompt cache configuration.
Enabled cross-session messaging via `SendMessage` and `ListAgents` APIs.
Fixed prompt-cache misses in long sessions caused by OAuth token refreshes.
Resolved issues with session disappearance after 30 days and login screen loops.
Improved Workflow tool prompt footprint by reducing description size from 5.7k to ~1k tokens.

These changes provide tighter security controls for restricted environments and improve reliability in long-running or multi-session workflows.

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