1XD

`{env:...}` variable substitution inconsistently fails for specific MCP server URLs

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## Summary Environment variable substitution using `{env:VAR_NAME}` syntax works for some remote MCP servers but fails for others, even when using identical configuration patterns. ## Environment - **OS**: macOS (darwin)...

feat: glob pattern-based external_directory permission

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## Summary Fixes #5395 - Extends the `external_directory` permission with: 1. **Read/write split**: Separate `read` and `write` permissions for external directory access 2. **Glob pattern-based rules**: Fine-grained path-based permission control...