refactor(autoloop): notify recipients via env vars

WeChat / WhatsApp recipient identifiers in src/autoloop/notify.ts are now
read from env vars (AUTOLOOP_WECHAT_RECIPIENT, AUTOLOOP_WECHAT_ACCOUNT,
AUTOLOOP_WHATSAPP_RECIPIENT). An unset channel is silently skipped and
the fallback chain moves to the next tier (email is the final tier and
unchanged).

Also: tasks/ is now in .gitignore (internal design / WIP notes live
locally only).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Enderfga

.gitignore

@@ -34,3 +34,7 @@ coverage/
 # All documentation lives under skills/. The repo is consumed by AI agents
 # that look there; docs/ is for local process scratch only and never shipped.
 docs/
+
+# Internal design docs and work-in-progress notes — local only.
+# Earlier history contained tasks/ files; those are scrubbed via filter-repo.
+tasks/

CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.5.4] - 2026-05-10
+
+### Changed
+
+- Notify channel recipient identifiers are now read from env vars
+  (`AUTOLOOP_WECHAT_RECIPIENT`, `AUTOLOOP_WECHAT_ACCOUNT`,
+  `AUTOLOOP_WHATSAPP_RECIPIENT`); an unset channel is silently skipped
+  and the fallback chain moves to the next tier.
+
 ## [3.5.3] - 2026-05-10
 
 ### Added — auto-compact on context-budget threshold