zhi 4f0e933de3 BE-CAL-007: MinimumWorkload warning rules + BE-CAL-008: past-slot immutability ...

BE-CAL-007: Workload warning computation (already implemented in prior wave,
verified tests pass - 24/24). Computes daily/weekly/monthly/yearly scheduled
minutes and compares against user thresholds. Warnings are advisory only.

BE-CAL-008: New slot_immutability service with guards for:
- Forbid edit/cancel of past real slots (raises ImmutableSlotError)
- Forbid edit/cancel of past virtual slots
- Plan-edit/plan-cancel helper to identify past materialized slot IDs
  that must not be retroactively modified
Tests: 19/19 passing.

2026-03-31 04:16:50 +00:00

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