instrumentation-interrupt

• The cmake-instrumentation(7) data version has been updated to 1.2.

• cmake-instrumentation(7) API now records an overall cmakeBuild snippet even when a cmake --build invocation is interrupted by the user (for example with Ctrl+C). The snippet includes a new interruptSignal field, recording the signal that interrupted the build, so that consumers can distinguish an interrupted build from one that ran to completion.