- Added session_status() === PHP_SESSION_NONE guard to six API files
(custom_fields, revoke_api_key, manage_templates, generate_api_key,
get_template, manage_recurring) that called bare session_start() after
RateLimitMiddleware had already started the session
- Registered /api/notifications.php and /api/user_avatar.php in index.php
router (were missing, served only by direct file access)
- Complete README rewrite: remove all Discord references (Matrix/hookshot
is the only external notification method), add hwmonDaemon API docs,
document all TDS v1.2 features (kanban, charts, SLA, command palette,
notification bell, watcher avatars, @mention, etc.), fix keyboard
shortcuts table, add Matrix/LDAP env vars to setup section
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>