[mdalikadar]

Description
Adds Windows support to SignalTrait, as discussed in #10589. Without PCNTL, registerSignals() now installs a console control handler through sapi_windows_set_ctrl_handler(). It is reported to the command as SIGINT (2), because the SIG* constants come from PCNTL and are not available on Windows. A command can then stop gracefully on Ctrl+C or Ctrl+Break through shouldTerminate(), onInterruption() or a mapped method, as it does on Unix.

• unregisterSignals() removes the handler.
• getSignalName() no longer touches the SIG* constants without PCNTL, so getProcessState() works there.
• withSignalsBlocked() stays a no-op on Windows, which is documented.
• The native function sits behind a small protected wrapper so tests can replace it. The new tests run on any OS.

Refs #10589

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[Copilot]

🟡 Changes recommended

Windows signal handling has unresolved callback-access failures, unsupported web-SAPI registration, and resource-retention defects, while the no-backend test can still install a native handler.

4 open issues

• Bind the Windows handler callback before registration · New
• Disable the Windows handler in the no-pcntl test · New
• Restrict Windows handler detection to console SAPIs · New
• Release the native callback when unregistering signals · New

What changed in this PR

Adds Windows console-event support to SignalTrait, addressing #10589 by letting CLI commands handle Ctrl+C and Ctrl+Break through the existing graceful-termination APIs.

Changes:

• Registers and removes Windows console handlers, reporting both events as SIGINT (2).
• Adds simulated Windows tests for registration, dispatch, cleanup, and operation without PCNTL.
• Documents Windows usage and limitations in the user guide and v4.8.0 changelog.

Validation used focused source inspection; runtime tests and full validation remain for CI.

File	Description
tests/​system/​CLI/​SignalWindowsTest.php	Tests Windows signal behavior using simulated handlers.
tests/​_support/​Commands/​Legacy/​SignalCommandWindows.php	Provides a Windows handler test double.
system/​CLI/​SignalTrait.php	Adds Windows registration, event dispatch, cleanup, and signal naming.
docs/​cli/​cli_signals.md	Explains Windows usage and signal-blocking limitations.
docs/​changelogs/​v4.8.0.md	Announces Windows console-event support.

_{Review effort: Balanced}