Phase 3 Slice 11a calculator hook for the rule-editor preview
(design §4.5, Q-H-4 option (a)). CalcOptions gains RuleOverrides
[]models.DeadlineRule. When non-empty, FristenrechnerService.Calculate
substitutes any rule with matching .ID in the rule list with the
override row, and appends overrides whose ID doesn't match an
existing rule (net-new drafts the editor wants to preview).
Wired into:
- FristenrechnerService.Calculate (proceeding-tree path)
- FristenrechnerService.calculateByTriggerEvent (Pipeline-C path)
Helper: applyRuleOverrides(src, overrides) — small linear scan since
the override slice is 1 row in practice (the draft being previewed).
Empty overrides → pass-through (existing behaviour unchanged).
No DB writes; pure simulation. The editor's "what would this rule
do?" affordance uses this to preview the draft against the rest of
the proceeding's rules without mutating the live corpus.
mAi
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