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#9400 (WIN-2003) added the ctrl_break() handler as a `#[cfg(windows)]` branch inside the two Windows-path `tokio::select!` blocks in shutdown_signal. tokio's `select!` macro does not accept `#[cfg(...)]` attributes on individual branches, so windmill-common fails to compile on Windows ("no rules expected this token in macro call"). This slipped through CI because the only job that builds the backend on Windows is cli-tests.yml's `test-windows`, which triggers only on `cli/**` changes — #9400 was backend-only. Fix: define `ctrl_break()` for the whole `not(any(linux, macos))` scope instead of just `windows`. On Windows it awaits the real CTRL_BREAK signal; on other non-unix targets it is a never-resolving future, so the branch is inert there. The select! branches become plain (no per-branch `#[cfg]`), which the macro accepts. Verified: the `#[cfg]`-on-branch form reproduces the exact macro error against tokio 1.46.1, and the fixed form compiles clean. Fixes WIN-2003 (Windows build regression) Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>