个人长报告同盘同日重试改为秒回

完整数据版在版本号明确时复用当天的结果。渲染快捷算法留下但默认关闭，本机只快了大约两成。

Co-Authored-By: Grok (agent loop)

scripts/report_perf_flags.py

@@ -0,0 +1,40 @@
+"""Call-time switches for long-report rendering and same-chart reuse.
+
+Values are read on every call so one process can measure the old path and the
+new path back to back. The old path stays in place when a switch is off.
+"""
+
+from __future__ import annotations
+
+import os
+
+# Masked Windows A/B on 2026-10-14. Render shortcuts are byte-identical and use
+# less memory, but the end-to-end drop was 20–23%, short of the 35% gate, so
+# the fast path stays off. Cache hits matched the miss bytes and returned in
+# about 0.06s, under the 1.5s gate. A missing or unknown GITHUB_SHA still
+# disables the cache at the call site.
+RENDER_FAST_DEFAULT = False
+REFERENCE_CACHE_DEFAULT = True
+
+_ON = {"1", "true", "yes", "on"}
+
+
+def _enabled(name: str, default: bool) -> bool:
+    raw = os.environ.get(name)
+    if raw is None or not raw.strip():
+        return default
+    return raw.strip().lower() in _ON
+
+
+def report_render_fast_enabled() -> bool:
+    """True when the equivalent render and hash shortcuts may run."""
+    return _enabled("JYOTISH_REPORT_RENDER_FAST", RENDER_FAST_DEFAULT)
+
+
+def report_reference_cache_enabled() -> bool:
+    """True when a full_data markdown response may be reused from disk.
+
+    A missing or ``unknown`` ``GITHUB_SHA`` still disables the cache at the
+    call site. This function only reads the switch.
+    """
+    return _enabled("JYOTISH_REPORT_REFERENCE_CACHE", REFERENCE_CACHE_DEFAULT)