Add 0.2s confirmatory calibration v4 workflow

[waqasm86]

This PR adds the canonical CommGuard calibration-v4 workflow.

Scientific motivation:

• calibration-v3 at 0.5 seconds completed but was only partially supported;
• the 1 MiB group passed the capture gate in 2/5 repetitions;
• the supported range was 4–128 MiB;
• diagnostic evidence selected 0.2 seconds prospectively;
• a full confirmatory run is still required because the diagnostic study did not test 1 MiB.

Calibration-v4 full plan:

• Kaggle NVIDIA Tesla T4 x2;
• 0.2-second sampling;
• five idle repetitions;
• five repetitions at 1, 4, 16, 64, and 128 MiB;
• 30 total observations.

Downstream execution remains blocked unless:

• scientific_acceptance_eligible is true;
• accepted is true;
• result_state is supported;
• modern_capture_gate_passed is true;
• source_dirty is false.

Local validation:

• Ruff passed;
• formatting passed;
• mypy passed;
• 188 tests passed;
• 6 hardware-only tests skipped on Windows;
• notebook generation check passed;
• delivery verification passed.

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