P2 validation: oracle test and large-scale raw X/Y check

- tests/oracle/test_p2_raw_xy.py: IDAT-assembled raw X/Y and controls
  equal the arrays in oracle GTCs
- validate_p1_large.py: phase-P2 comparison against vendor GTCs with
  diagnostics (channel swap, bead-count disagreements)
- cloud trial: also runs `simurg ingest` on all samples (time/memory),
  disk 250 GB

scripts/cloud/trial.sh

@@ -16,7 +16,7 @@ REGION=${REGION:-us-east-1}
 TYPE=${TYPE:-m7g.4xlarge}
 MAX_PRICE=${MAX_PRICE:-0.30}        # USD/hour spot cap (on-demand is 0.6528)
 MAX_MINUTES=${MAX_MINUTES:-360}     # hard cap: 6 hours
-DISK_GB=${DISK_GB:-200}
+DISK_GB=${DISK_GB:-250}
 BUDGET_USD=${BUDGET_USD:-10}
 TAG=simurg-trial
 ACCOUNT=$(aws sts get-caller-identity --query Account --output text)