docs: define continuity dispatch receipt core fields

docs/runbooks/approved-plan-continuity.md

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+# Approved Plan Continuity
+
+## Continuity receipt core fields
+
+### `planId`
+- The identifier of the approved plan that the continuity receipt belongs to.
+- Use this field to associate the receipt with one specific approved plan.
+
+### `currentTask`
+- The task from the approved plan that is currently being executed or has just completed.
+- Use this field to record which plan task the receipt is about.
+
+### `nextDerivedAction`
+- The next concrete action derived from the current task that should be dispatched to continue the workflow.
+- Use this field to record the intended follow-up action for continuity.
+
+### `dispatchedAt`
+- The timestamp indicating when the next derived action was actually dispatched.
+- Use this field to record when the continuity handoff occurred.