refactor: one list resolver, one reminder resolver and one field-update applier in ReminderService

[k3KAW8Pnf7mkmdSMPHz27]

Twelfth of the refactoring series: the duplicated lookups and field switches in ReminderService collapse, under the write-path tests from #23.

Change

• calendarInAllowlist(id:) checks the allowlist, then looks the list up. It replaces four copies.
• reminderInAllowlist(id:) looks the reminder up, then checks its list. It replaces three copies and keeps the hidden-looks-missing rule.
• ReminderFieldUpdate.apply turns seven three-state switches in the update path into one line each, in the same order. It is internal.
• Date components take a ReminderDateValue on both paths, and makeAlarms validates and builds in one pass.
• The fetch completion is @Sendable, so touching actor state inside it no longer compiles.
• The forEach format rule is back on, and the cyclomatic-complexity ceiling drops from 31 to 17.

Verification

• The write-path suites from test: inject the EventKit writes behind the reminder store seam #23 pass unchanged.
• swift test: 88 library tests and 107 server tests pass.
• The tool-contract snapshot is unchanged, and both lints pass.

Mutation record

Mutation	Failing tests
Swap the two guards in calendarInAllowlist	A list query checks the allowlist before looking the list up; Create checks the allowlist before looking the list up; Deleting a list checks the allowlist before looking it up; Moving a reminder checks the allowlist before looking the target list up
reminderInAllowlist throws listAccessDenied	A reminder in a hidden list reads, updates and deletes like a missing one
Apply alarms before the start date	Update applies the start date before validating relative alarms
Read pendingReminderFetch inside the fetch callback	Does not compile: "actor-isolated property 'pendingReminderFetch' can not be referenced from a Sendable closure"

Release impact

None.

https://claude.ai/code/session_01XR9wyQPT1iM8wzP9hvmYRu

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🎉 This PR is included in version 3.0.0 🎉

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