feat: add stress_list_queries tool and document in tests/README

Concurrent read-only stress test against V3 list endpoints.
Improvements over initial version: --base-url, --limit CLI flags,
interpolated percentile calculation (accurate on small sample sizes),
and pre-sorted times passed to overall summary.
README: added tools table with quick-reference usage examples.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/README.md

@@ -7,7 +7,7 @@ This directory contains the automated and manual test scripts for the Aether Fas
 - **`unit/`**: Isolated logic tests. These use heavy mocking to bypass database and network requirements. Fast and safe to run in any environment.
 - **`integration/`**: Local environment tests. These verify component interactions, often requiring a connection to the local MariaDB/Redis instance.
 - **`e2e/` (End-to-End)**: Network-based API tests. these use the `requests` library to call the live API endpoints at `https://dev-api.oneskyit.com`.
-- **`tools/`**: Utility scripts for administrative tasks like registry generation or Docker exploration.
+- **`tools/`**: Utility scripts for administrative tasks like registry generation, Docker exploration, and performance stress testing.
 - **`archive/`**: Legacy or deprecated scripts kept for historical reference.
 
 ## 📜 Standardized E2E Suite (`tests/e2e/`)
@@ -38,6 +38,28 @@ These consolidated scripts are the primary verification tool for the V3 API.
 
 ---
 
+## 🔧 Tools (`tests/tools/`)
+
+| Script | Description |
+| :--- | :--- |
+| `stress_list_queries.py` | **Read-only concurrency stress test.** Fires N worker threads making R sequential requests across all V3 list endpoints. Reports per-endpoint p50/p95/max latency and error counts. CLI: `--workers` (default 10), `--requests` (default 5), `--limit` (default 20), `--base-url` (default dev API). Exit code 1 on any error. |
+| `tool_generate_registry.py` | Generates the object type registry from source definitions. |
+| `tool_mcp_docker_explorer.py` | Explores running Docker containers via the MCP bridge. |
+
+**Stress test quick reference:**
+```bash
+# Baseline (10 workers, 5 rounds, 400 total requests)
+./environment/bin/python3 tests/tools/stress_list_queries.py
+
+# Heavy load (35 workers, 5 rounds, 1400 total requests)
+./environment/bin/python3 tests/tools/stress_list_queries.py --workers 35 --requests 5
+
+# Target a different environment
+./environment/bin/python3 tests/tools/stress_list_queries.py --base-url https://api.oneskyit.com --workers 5
+```
+
+---
+
 ## 🛠️ Shared Helpers
 
 - **`mock_config_helper.py`**: A critical utility that mocks `app.config.settings` before other modules are imported. Use this in unit tests.