Replace python3 heredocs with node heredocs in both workflow files, aligning the pre-step runtime with actions/github-script.

Workflow changes

• workflows/autoloop.md: Scheduling pre-step rewritten in JS — parseMachineState, parseSchedule, getProgramName, readProgramState, program scanning, issue fetching via fetch(), selection logic
• workflows/sync-branches.md: Branch sync rewritten in JS using child_process.spawnSync for git operations

Before:

python3 - << 'PYEOF'
import os, json, re, glob, sys
import urllib.request, urllib.error
from datetime import datetime, timezone, timedelta
# ...
PYEOF

After:

node - << 'JSEOF'
const fs = require('fs');
const path = require('path');
// ...
async function main() { /* ... */ }
main().catch(err => { console.error(err.message || err); process.exit(1); });
JSEOF

Test infrastructure

• tests/conftest.py: Extracts JS functions from the JSEOF heredoc, writes to a temp .cjs module, calls via node subprocess. Python wrappers handle type conversion (e.g., parseSchedule returns ms → wrapped to timedelta).
• tests/test_scheduling.py: Updated docstrings only; all 88 tests pass unchanged against the JS implementation.