Method checkpoint

ci/meson/build_timer.py:36–40

Record a timing checkpoint.

(self, name: str)

        self._checkpoints["start"] = self._start_time

    def checkpoint(self, name: str) -> None:
        """Record a timing checkpoint."""
        if self._start_time is None:
            raise RuntimeError("Timer not started - call start() first")
        self._checkpoints[name] = time.time()

    def calculate_phases(self) -> None:
        """Calculate phase durations from checkpoints."""