chore(scripts): add scripts index and archive one-shot scripts (#4822)

chore(scripts): index scripts/ and archive 29 one-shot scripts

backlog#1153 infra-13. scripts/ had 80+ unlabelled top-level entries
mixing CI gates with finished one-shot issue-validation scripts.

- scripts/README.md — one index row per entry with status
  (ci-gate / dev-tool / archived), purpose, and wiring; subdirectories
  get one row each. run_scanner_benchmarks.sh is annotated
  "disposition owned by backlog perf-10" and deliberately untouched.
- git mv 29 confirmed-stale one-shot entries to scripts/archive/:
  11 issue-scoped validation/perf-capture scripts, the 5-script
  backlog#706 large-PUT breakdown family, the 4-file GET-optimization
  stress suite, 2 gt1g one-shots, and 7 other orphaned one-shots.
  Evidence: a whole-tree boundary-aware reference census showed zero
  references from CI/Makefiles/docs/code for every moved entry (or
  references only from other scripts inside the same archived set);
  re-run after the move shows zero dangling references.
- docs/testing/README.md links the index.

Moves only — no script content changed.

scripts/archive/README-stress-test.md

@@ -0,0 +1,119 @@
+# GET Optimization Stress Test Scripts
+
+## Quick Start
+
+### Prerequisites
+
+- `warp` installed (https://github.com/minio/warp)
+- `mc` configured with access to the RustFS server
+- RustFS server running with GET optimizations enabled
+
+### Quick Validation (5 minutes)
+
+```bash
+./scripts/quick-validate-get-optimization.sh localhost:9000
+```
+
+This runs basic functional tests:
+- Data integrity verification
+- Concurrent GET stability
+- Early-stop behavior validation
+
+### Full Stress Test (30+ minutes)
+
+```bash
+./scripts/stress-test-get-optimization.sh localhost:9000 ./stress-results
+```
+
+This runs comprehensive tests:
+- Data correctness validation (1KB, 1MB, 10MB objects)
+- Concurrent GET stress test (16, 64, 256 concurrency)
+- Mixed read/write workload
+- Early-stop behavior under load
+
+## Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `WARP_ACCESS_KEY` | rustfsadmin | S3 access key |
+| `WARP_SECRET_KEY` | rustfsadmin | S3 secret key |
+| `MC_ALIAS` | rustfs | mc alias for the server |
+| `TEST_BUCKET` | auto-generated | Test bucket name |
+| `TEST_DURATION` | 300s | Duration for stress tests |
+| `CONCURRENCY` | 64 | Default concurrency level |
+
+## Test Scenarios
+
+### 1. Data Correctness Validation
+
+Verifies that GET returns correct data with early-stop enabled:
+- Uploads random data
+- Downloads and compares MD5 hash
+- Tests different object sizes (1KB, 1MB, 10MB)
+
+### 2. Concurrent GET Stress Test
+
+Tests performance under high concurrency:
+- Object sizes: 1KiB, 1MiB, 4MiB, 10MiB
+- Concurrency levels: 16, 64, 256
+- Duration: configurable (default 300s)
+
+### 3. Mixed Read/Write Stress Test
+
+Tests stability under concurrent read/write:
+- 50% reads, 50% writes
+- 1MB objects
+- 64 concurrent operations
+
+### 4. Early-Stop Behavior Validation
+
+Verifies early-stop works correctly:
+- 100 sequential reads of the same object
+- Verifies data size matches expected
+- Checks for any download failures
+
+## Expected Results
+
+### Success Criteria
+
+- **Data Correctness**: 100% pass rate (no data corruption)
+- **Concurrent GET**: No errors, consistent latency
+- **Mixed Workload**: No deadlocks or data corruption
+- **Early-Stop**: All reads return correct data size
+
+### Performance Baselines
+
+| Object Size | Expected Throughput | Expected p95 Latency |
+|-------------|--------------------|--------------------|
+| 1KiB | > 5 MiB/s | < 10ms |
+| 1MiB | > 500 MiB/s | < 20ms |
+| 4MiB | > 1000 MiB/s | < 30ms |
+| 10MiB | > 2000 MiB/s | < 50ms |
+
+## Troubleshooting
+
+### Common Issues
+
+1. **warp not found**: Install with `go install github.com/minio/warp@latest`
+2. **mc not configured**: Run `mc alias set rustfs http://localhost:9000 admin password`
+3. **Connection refused**: Verify RustFS is running and accessible
+4. **Permission denied**: Check S3 credentials
+
+### Debug Mode
+
+Enable debug logging:
+```bash
+RUST_LOG=rustfs_ecstore::bucket::lifecycle=debug ./scripts/stress-test-get-optimization.sh
+```
+
+## Output Files
+
+| File | Description |
+|------|-------------|
+| `test-config.txt` | Test configuration |
+| `correctness-results.txt` | Data correctness results |
+| `early-stop-results.txt` | Early-stop validation results |
+| `get-*.json` | Concurrent GET performance (warp JSON) |
+| `mixed-*.json` | Mixed workload performance (warp JSON) |
+| `correctness-errors.log` | Data correctness errors (if any) |
+| `early-stop-errors.log` | Early-stop errors (if any) |