Add revise_input command

Author: flyinggrizzly

lib/claude/commands/revise_input.md

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+We are going to produce a revised version of a task or markdown document.
+
+The document to improve is #ARGUMENT. We will call this the Original.
+
+Based on our conversation, produce a revised version of the Original that includes amendments, improvements, or even
+ellisions, that **had they been there in the first place**, would have meant that I did not have to step in and guide or
+ask you to revise how you got to your final result.
+
+YOU MUST NOT MODIFY THE ORIGINAL.
+
+## Naming the revised document
+
+Append some alpha marker to the document name, indicating it's a later, alternate version.
+
+For example, if the Original were `task_v1.md`, you would call your revision `task_v1a.md`.
+
+If the Original were `task_v1a.md`, your revision would be `task_v1b.md`
+
+etc