rename ss-tools to superset-tools across the entire project

- Replace all occurrences of 'ss-tools' with 'superset-tools' in 104 files
- Rename git bundle file ss-tools.bundle → superset-tools.bundle
- Update .gitignore pattern accordingly
- Preserve variable names (hasSsTools etc.) and code identifiers

.opencode/command/speckit.plan.md

@@ -1,5 +1,5 @@
 ---
-description: Execute the implementation planning workflow for ss-tools (Python backend + Svelte frontend) and generate research, design, contracts, and quickstart artifacts.
+description: Execute the implementation planning workflow for superset-tools (Python backend + Svelte frontend) and generate research, design, contracts, and quickstart artifacts.
 handoffs:
   - label: Create Tasks
     agent: speckit.tasks
@@ -143,7 +143,7 @@ Every contract in `contracts/modules.md` MUST pass these checks. Contracts that
 
 ### Data Model Output
 
-Generate `data-model.md` for ss-tools domain entities such as:
+Generate `data-model.md` for superset-tools domain entities such as:
 - Pydantic request/response schemas
 - SQLAlchemy models and relationships
 - WebSocket message formats