feat(t-paliad-086): import youpc deadline-calc data — PR-1
New migration 028 mirrors youpc.org's event-driven deadline calc into
the paliad schema. Three new reference tables seeded from production
youpc data:
- paliad.trigger_events (102 rows) — UPC procedural events that start
deadlines (e.g. statement_of_claim, decision_handed_down, oral_hearing)
- paliad.event_deadlines (70 rows) — deadlines flowing from each trigger,
with duration/unit/timing + composite-rule support
- paliad.event_deadline_rule_codes (72 rows) — m:n RoP citation links
IDs preserved verbatim from youpc to enable future diff-based re-syncs.
Composite-rule wiring (alt_duration_value + alt_duration_unit + combine_op)
encodes "31 days OR 20 working_days, whichever is longer" for R.198 and
R.213 (start of merits after evidence preservation / provisional
measures). PR-2 wires the working_days primitive into the calculator.
Source bug fix during import: rule_code 'Rop.109' (lowercase typo on
youpc side, deadline 69) → 'RoP.109'. Matches paliad audit
recommendation 4 (canonical RoP.NNN.x format).
Models added: TriggerEvent, EventDeadline, EventDeadlineRuleCode.
PR-2 will add the service + handler + UI; PR-3 ships Tier 1 fixes.
Migration validated via dry-run on production Supabase (BEGIN/ROLLBACK
transaction, schema + check constraints + FKs all consistent).
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