agent_panel: alerts use the macro persona's verdict; all 4 takes still logged

agent_panel.verdict_source defaults to "macro": the macro take's stance is the
verdict, the synthesizer call is skipped (4 LLM calls per panel instead of 5);
"chair" restores the four-voice consensus + OPPOSE guard. Verdict source is
cached per mode and logged (panel_verdict_source). 406 tests.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FC4s6VCURFte4dub4xKxYL

app_config.py

@@ -98,6 +98,7 @@ _KNOWN_AGENT_PANEL = {
     "enabled", "telegram", "dashboard", "min_quality",
     "max_panels_per_day", "reuse_ttl_seconds",
     "candles_enabled", "candle_bars_primary", "candle_bars_confirm",
+    "verdict_source",
 }
 _KNOWN_MARKET_OUTLOOK = {"enabled", "telegram", "max_per_day", "candles_bars"}
 _KNOWN_SIGNAL_LOG = {"enabled", "path", "log_blocked_scans"}
@@ -315,6 +316,11 @@ def load_app_config(path: str = CONFIG_PATH) -> AppConfig:
                 raise AppConfigError(
                     f"config.json: agent_panel.{key} must be an integer "
                     "between 1 and 100")
+    if "verdict_source" in panel and panel["verdict_source"] not in \
+            ("macro", "chair"):
+        raise AppConfigError(
+            'config.json: agent_panel.verdict_source must be "macro" or '
+            '"chair"')
     app.agent_panel_settings = dict(panel)
 
     outlook = raw.get("market_outlook", {})