fix(tasks): remove non-functional reminder write params (v1.1.2)

Exhaustive FW_DEBUG investigation on both Free and Premium accounts
confirmed that taskupdate2 silently ignores all reminder fields regardless
of encoding (flat, JSON-string, PHP-bracket, all variants). Alternative
endpoints (tasksetalert etc.) are unregistered. Root cause: mobile app
Service Worker transforms reminder requests in ways not reproducible via
direct API calls. Reminders remain read-only. Recurrency write confirmed
working (flat encoding). Docs updated with full investigation findings.

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

CHANGELOG.md

@@ -10,6 +10,29 @@ 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.
 
+## [1.1.2] – 2026-04-17
+
+### Fixed
+- `update_task`: removed non-functional reminder write parameters (`reminder_unit`,
+  `reminder_value`, `clear_reminder`) — exhaustive FW_DEBUG testing (flat params,
+  JSON-string, PHP-bracket, all string values, with/without `localId`, alternative
+  endpoints) on both Free and Premium accounts confirmed that `taskupdate2` silently
+  ignores all reminder fields; historical SNOOZE reminders were set via the mobile
+  app's Service Worker which transforms requests in ways not reproducible via direct API
+- `update_task`: docstring now explicitly states reminders are read-only
+- SPEC.md: documented reminder write limitation with investigation findings
+- CLAUDE.md: updated reminder row to reflect read-only status
+
+### Investigation notes
+- Tested formats: flat int params, flat string params, JSON-encoded string value,
+  PHP-bracket notation (`reminder[reminderUnit]=DAY`), no-`localId` variant
+- Tested endpoints: `tasksetalert`, `taskalertput`, `taskreminderset`, `taskalert`,
+  `tasknotification` — all return `"The call X is not registered"`
+- Verified on both test account (Free) and real account (Premium) — same result
+- Recurrency write via flat params is confirmed working (separate from reminder)
+
+---
+
 ## [1.1.1] – 2026-04-17
 
 ### Fixed