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feat(mcp): let MCP clients read and edit every project, not only the open one #2690

Job	Run time
Swift test (macOS capture helper)	1m 40s
Lint	40s
Rust check (Windows compositor)	3m 22s
Build	1m 1s
AppStream metadata	18s
Typecheck (tests)	53s
Docs	6s
Rust test (macOS compositor)	4m 8s
Validate PR title (semantic)	4s
Test	1m 58s
Type Check	36s
Rust test (Linux compositor)	12m 20s
	27m 6s