Point prompt and README at the Orca fork

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

PROMPT.md

@@ -18,6 +18,15 @@ target, print it, and have it still flex.
 **Random colours on the outside are wanted.** Purge showing on the exterior in
 unplanned colours is the desired look, not a defect. Do not hide it inside infill.
 
+## Repositories
+
+- This repo (docs, prompt, STL, patches): `http://10.0.10.2:3000/fred/flush-fidget.git`
+- Orca fork (code changes go here): `http://10.0.10.2:3000/fred/OrcaSlicer.git`
+  A plain copy of upstream `OrcaSlicer/OrcaSlicer`, not a mirror, so you can push
+  branches. Upstream has 75 branches. Branch from `main`. Add upstream as a remote:
+  `git remote add upstream https://github.com/OrcaSlicer/OrcaSlicer.git`.
+  Both repos are private. Fred will give each agent its own token.
+
 ## Success test
 
 Slice a 4-colour model with the Flexi Cube on the plate as the purge target. Then:

README.md

@@ -14,4 +14,4 @@ patches/           changes to the Orca fork, as patch files
 tests/             baseline numbers and test slices
 ```
 
-The Orca Slicer fork is a separate repository.
+The Orca Slicer fork is a separate repository: `http://10.0.10.2:3000/fred/OrcaSlicer.git`.