docs: add feature header images

docs/clonedeps.md

@@ -1,5 +1,7 @@
 # Clonedeps
 
+![Clonedeps dependency source workspace](../img/clonedeps.jpg)
+
 `clonedeps` is a bundled Orchestrator skill for cloning a small set of important
 dependency source repositories into a local, ignored workspace so agents can
 inspect library internals while working on your project.

docs/subtask.md

@@ -1,5 +1,7 @@
 # Subtask
 
+![Subtask worker session](../img/subtask.png)
+
 `/subtask` lets the current agent spin up a separate, bounded worker session for
 one specific piece of work. The worker runs as an orchestrator in a real child
 session, completes the requested task, and sends a structured summary back to