describe-structurelisted

## Context marker 🔺 When the skill activates, begin the first commentary update with `🔺` and a concise `Using describe-structure ...` announcement. Do not repeat the marker on later updates unless another skill activates. # Describe Structure **REQUIRED:** Use this skill whenever coding with test-driven development or Continuous Specification. When a test file already has a root `describe`, organize the new or changed specifications so the affected tree reads as complete behavior sentences. Preserve a flat test file with no `describe` structure. ```text Component when the playback probe starts given a rejected play request reports unsupported playback ``` ## Build the hierarchy - Extract the action or triggering event from each existing `it` caption into a `describe` caption beginning with `when`. - Extract each state, input, or precondition into a nested `describe` caption beginning with `given`. - Write every `describe` and `it` caption for people, in plain-English domain language; try not to use a code function, method, or API name as the caption. - Keep the observable outcome in the `it` caption. - Put shared actions above their distinct givens. A `when` block should contain every applicable `given` branch. - Read every root-to-leaf path aloud. Each must be grammatical without relying on test setup code. Use `given` for a condition: `given a nullable probe with a configured result`. Use `when` for an event: `when disposing the session`. Write `whe