feat(tasks): add recurrency and reminder write support to update_task (v1.1.0)

Verified parameters from JS-Bundle xb-Encoder/fc-Encoder now wired up:
recurrencyDescriptor (recurrency, recurrencyInterval, rrule) and reminder
(reminderUnit, reminderValue). Adds clear_recurrency and clear_reminder flags.
SPEC.md, CHANGELOG.md, CLAUDE.md updated accordingly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -10,6 +10,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 This project follows Semantic Versioning (SemVer).
 Breaking changes (removed tools, changed parameters) increment the major version.
 
+## [1.1.0] – 2026-04-17
+
+### Added
+- `update_task`: recurrency parameters (`recurrency`, `recurrency_interval`, `rrule`,
+  `clear_recurrency`) — set or remove task recurrence rules via `recurrencyDescriptor`
+- `update_task`: reminder parameters (`reminder_unit`, `reminder_value`, `clear_reminder`)
+  — set or remove task reminders via `reminder`
+- SPEC.md: documented `recurrencyDescriptor` and `reminder` fields for `taskupdate2`
+  (verified via JS-Bundle xb-Encoder / fc-Encoder)
+
+---
+
 ## [1.0.1] – 2026-04-17
 
 ### Added