Changelog for Altworx 26.15.0

Altworx now requires Elixir ~> 1.20, Erlang/OTP 29, and Runbox 25.0.0. Scenarios need to be upgraded to these versions; scenarios built with older versions will stop working.

Notification channels must be migrated to config.ini before upgrading to this version; this version permanently deletes the notification channels table from the database.

Asset Map: Add ai_conversations and ai_messages tables (PR, #7949)
Asset Map: Sort entities in Graph APIs (PR, #7734)
Asset Map: Remove notification channels table from DB (PR, #7863)
Support new SM 2.0 notification format in story modeller parser (PR, #7962)
Upgrade to Elixir 1.20.2 and Erlang 29.0.3 (PR, #7797)
Upgrade database image to v5.1.0 (PostgreSQL 18.4) (PR, #7796)
Upgrade Zookeeper to 3.9.5 (PR, #7795)
Fix normalizer output with current message version (PR, #7962)
Upgrade Node to 24.18.0 (PR, #7800)
Compile test support modules via elixirc_paths instead of ad-hoc loading; rename Asset Map aql/sql doctests so they actually run (PR, #7988)
Upgrade to Tailwind 4.3.3 and altworx_ui_components v6.7.0 (PR, #7802)
Upgrade livebook to 0.19.8 (PR, #7801)
Admin UI: Prevent saving unchanged notification template (PR, #7711)
Story Modeller Scenario: Produce unified notifications with Firebase channel (PR, #7963)
Upgrade Phoenix to 1.8.9 and LiveView to 1.2.7 (PR, #7798)