fix: resolve broken pipe and JSONDecodeError in poll-validation.sh

[aavinash-nr]

What

Fixes a silent crash in poll-validation.sh that happens when layer validation fails. The script was supposed to print which specific functions failed and why, but instead it threw a broken pipe + JSONDecodeError, so the failure detail was never shown.

Why it broke

The original code piped $result into python3 while also using a heredoc for the script body — both trying to own Python's stdin at the same time. Bash gives the heredoc priority, leaving the pipe unread → broken pipe. Python then reads an empty stdin → JSONDecodeError.

# broken
echo "$result" | python3 - <<'PYEOF'
import json, sys
d = json.load(sys.stdin)  # sys.stdin is empty, crash
PYEOF

Fix

Write the result to a temp file and read from there, so there's no stdin conflict.

printf '%s' "$result" > /tmp/val_result.json
python3 <<'PYEOF'
import json
with open('/tmp/val_result.json') as f:
    d = json.load(f)
PYEOF

Test Plan

• Validation failure run: per-function failure detail prints correctly, no broken pipe error
• Validation pass run: no regression in the success path

🤖 Generated with Claude Code

[Sashwatdas123]

LGTM