Writing Plugin Migrations
Where plugin migrations live, how they're ordered and applied, and the tables-vs-seed-data separation to respect.
Result Handlers & the Completion Transaction
The most important extension point — how the core hands you a completed workflow's result inside a transaction, and the rules you must follow.
How the Plugin Loader Discovers & Validates Plugins
What happens at API startup — how the loader finds your plugin, what it validates, and what happens on success or failure.