Update documentation to include snapshot functions

- Added snapshot functions to SDK requirements
- Updated testing guide with snapshot examples
- Added snapshot checklist items for refactoring
- Clarified image() function in utilities section

All agents refactoring SDKs must now implement:
- sessionSnapshot(session_id, opts)
- serviceSnapshot(service_id, opts)
- listSnapshots(opts)
- restoreSnapshot(snapshot_id, opts)
- deleteSnapshot(snapshot_id, opts)

REFACTORING_CHECKLIST.md

@@ -24,6 +24,13 @@ Use this checklist when refactoring a UN SDK to ensure nothing is missed.
 - [ ] `cancelJob(job_id)` - Cancel running job
 - [ ] `listJobs(limit)` - List active jobs
 
+### Snapshots (NEW!)
+- [ ] `sessionSnapshot(session_id)` - Create session snapshot
+- [ ] `serviceSnapshot(service_id)` - Create service snapshot
+- [ ] `listSnapshots()` - List all snapshots
+- [ ] `restoreSnapshot(snapshot_id)` - Restore from snapshot
+- [ ] `deleteSnapshot(snapshot_id)` - Delete snapshot
+
 ### Utilities
 - [ ] `languages(cache_ttl)` - Get supported languages
 - [ ] `languageInfo(language)` - Get language details

tests/AGENT_REFACTORING_INSTRUCTIONS.md

@@ -25,7 +25,14 @@ Every refactored SDK needs:
    listJobs()
    languages()
    detectLanguage(filename)
-   image(code, output_format)
+   image(prompt, opts)
+
+   # Snapshot functions (NEW!)
+   sessionSnapshot(session_id, opts)
+   serviceSnapshot(service_id, opts)
+   listSnapshots(opts)
+   restoreSnapshot(snapshot_id, opts)
+   deleteSnapshot(snapshot_id, opts)
    ```
 
 2. **Credential system** (4-tier with fallback)

tests/SDK_TESTING_GUIDE.md

@@ -134,8 +134,26 @@ jobs = list_jobs(limit: int = 100) -> list[dict]
 # Get supported languages
 languages = languages(cache_ttl: int = 3600) -> list[str]
 
-# Get language info
-info = language_info(language: str) -> dict
+# Generate image from text prompt
+result = image(prompt: str, model: str = None, size: str = "1024x1024") -> dict
+```
+
+### Snapshot Functions
+```python
+# Create session snapshot
+snap = session_snapshot(session_id: str) -> dict
+
+# Create service snapshot
+snap = service_snapshot(service_id: str) -> dict
+
+# List all snapshots
+snaps = list_snapshots() -> dict
+
+# Restore from snapshot
+result = restore_snapshot(snapshot_id: str) -> dict
+
+# Delete snapshot
+delete_snapshot(snapshot_id: str) -> dict
 ```
 
 ### Credential Functions