v0.27.2: Project-level MCP configs, IDE command, and custom model improvements

New features

- Project-level MCP configs - Configure MCP servers at the project level using .factory/mcp.json
- /ide command - New command to manage VS Code, Cursor, and Windsurf IDE integrations. Shows current extension version or prompts to install
- Extra args in custom models - Pass additional arguments to custom model configurations e.g. service_tier, temperature, top_p, etc

Bug fixes

- Fixed task tool infinite wait when running subagents
- Fixed expanding tilde (~) paths when loading sessions
- Improved @ search rankings - exact filename matches now appear at the top with VSCode-style two-column display
- Removed automatic creation of .factory/skills folders
- Show compacting state when triggered
- Consolidate markdown rendering (fixes missing character in spec mode)
- Parallelize loading certificates on Windows