fix(chart): lock synastry chart calls and stop overwriting the A/B note

The bounced contract still looked for the old chart calls. The research script now writes to a temp directory unless --out is set. Quota splits stay unimplemented.

Co-Authored-By: Grok (agent loop)

scripts/research/api_chart_subprocess_ab.py

@@ -10,12 +10,14 @@ generated_at, created_at, timestamp, elapsed_seconds, elapsed_ms, duration_ms, r
 
 from __future__ import annotations
 
+import argparse
 import json
 import os
 import random
 import statistics
 import subprocess
 import sys
+import tempfile
 import threading
 import time
 from concurrent.futures import ThreadPoolExecutor
@@ -246,7 +248,22 @@ def _simulate() -> list[dict]:
     return [run(mode) for mode in ("O1", "O2", "O3", "O4")]
 
 
-def main() -> None:
+def resolve_record_path(explicit: str | None) -> Path:
+    """Write the A/B JSON only where asked. The committed note stays untouched."""
+    if explicit:
+        return Path(explicit)
+    directory = Path(tempfile.mkdtemp(prefix="api-chart-subprocess-ab-"))
+    return directory / "api-chart-subprocess-gate-ab-20261013.json"
+
+
+def main(argv: list[str] | None = None) -> None:
+    parser = argparse.ArgumentParser(description="A/B for issue #64 chart subprocess gate")
+    parser.add_argument(
+        "--out",
+        default=None,
+        help="Write the JSON record to this path. Omit to use a fresh temp directory, not the committed docs/testing file.",
+    )
+    args = parser.parse_args(argv)
     counter = _Counter()
     counter.install()
     charts = _measure_charts(counter)
@@ -263,8 +280,10 @@ def main() -> None:
         "jhora_installed": False,
     }
     text = json.dumps(out, ensure_ascii=False, indent=2)
-    dest = ROOT / "docs" / "testing" / "api-chart-subprocess-gate-ab-20261013.json"
+    dest = resolve_record_path(args.out)
+    dest.parent.mkdir(parents=True, exist_ok=True)
     dest.write_text(text + "\n", encoding="utf-8")
+    print(dest, file=sys.stderr)
     print(text)