reorganize

README.md

@@ -205,6 +205,20 @@ build.py                      # Build: .md → .yaml + .json + .prompt.md
 generated/                    # Build output (gitignored)
 ```
 
+## Source Mirrors
+
+External source repositories used during integration are kept under `sources/`:
+
+```text
+sources/
+├── Anthropic-Cybersecurity-Skills/
+├── paperclip-docs-main/
+└── temp-cyber-skills/
+```
+
+- `build.py` prefers `personas/_shared` as canonical input.
+- If `personas/_shared` is missing, `build.py` falls back to known mirrors under `sources/`.
+
 ### Variant Types
 
 | Type | Purpose | Example |