Claude Code v2.1.208 adds screen reader mode and fixes background agent bugs

Claude Code version 2.1.208 introduces an opt-in screen reader mode for plain-text rendering and addresses several critical issues with background agents and session stability.

• Added `claude --ax-screen-reader` flag and settings to enable plain-text rendering for accessibility.
• Introduced `CLAUDE_CODE_PROCESS_WRAPPER` environment variable to allow corporate launchers to intercept self-spawned processes.
• Fixed a regression where Bedrock auth failed for AWS SSO profiles with mismatched regions.
• Resolved issues where background agent replies were lost on delivery failure and sessions crashed on HTTP/2 GOAWAY errors.
• Addressed memory leaks in long sessions, including unbounded MCP stderr accumulation and LSP document retention.
• Fixed context window resetting to 200k after CLI auto-updates and truncated JSON output when piping large responses.

These changes improve accessibility for screen reader users and enhance the reliability of background agent workflows and session management.