Launch docs and external readiness

Problem

There is no external-facing documentation for the execution adapters. New users who install the core runtime have no reference for how to configure a database source, write a query in a dashboard YAML, or troubleshoot adapter-specific errors. The existing internal docs assume familiarity with the codebase and are not structured as executable getting-started guides. Without launch-quality documentation, external users cannot adopt the runtime without reverse-engineering the source code.

Context

Possible Solutions

Plan

Implementation Progress

Review Feedback

• Review cleared