v2.1.49 is a mixed bug-fix and performance/UX release: it fixes ignored Ctrl+C/ESC with background agents, multiple cache/regression issues, plugin scope auto-detection, resume picker rendering, and several long-session memory leaks (tree-sitter/Yoga WASM), while improving startup/non-interactive performance by skipping or batching API calls and caching MCP auth failures. It also expands capabilities for integrators with new SDK model capability fields, permission suggestions on safety “ask” responses, and a new ConfigChange hook for auditing/controlling config edits; simple mode now supports direct file editing. Note: Sonnet 4.5 (1M context) is removed from the Max plan in favor of Sonnet 4.6 (1M), so users may need to switch models in /model.