feat(agent): add strategy quality introspection

Log full strategy JSON at debug level, show full anyhow cause chain on
submit failures, surface condition_audit_summary for 0-trade results in
both logs and the summary fed back to the AI each iteration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/agent.rs

@@ -3,7 +3,7 @@ use std::time::Duration;
 
 use anyhow::{Context, Result};
 use serde_json::Value;
-use tracing::{error, info, warn};
+use tracing::{debug, error, info, warn};
 
 use crate::claude::{self, ClaudeClient, Message};
 use crate::config::{Cli, Instrument};
@@ -190,6 +190,7 @@ pub async fn run(cli: &Cli) -> Result<()> {
             strategy["candle_interval"].as_str().unwrap_or("?"),
             strategy["rules"].as_array().map(|r| r.len()).unwrap_or(0)
         );
+        debug!("strategy JSON:\n{}", serde_json::to_string_pretty(&strategy).unwrap_or_default());
 
         // Save the strategy JSON
         let strat_path = cli.output_dir.join(format!("strategy_{iteration:03}.json"));
@@ -215,10 +216,15 @@ pub async fn run(cli: &Cli) -> Result<()> {
             {
                 Ok(result) => {
                     info!("  {}", result.summary_line());
+                    if result.total_positions.unwrap_or(0) == 0 {
+                        if let Some(audit) = &result.condition_audit_summary {
+                            info!("  condition audit: {}", serde_json::to_string_pretty(audit).unwrap_or_default());
+                        }
+                    }
                     results.push(result);
                 }
                 Err(e) => {
-                    warn!("  backtest failed for {}: {e}", inst.symbol);
+                    warn!("  backtest failed for {}: {e:#}", inst.symbol);
                     results.push(BacktestResult {
                         run_id: uuid::Uuid::nil(),
                         instrument: inst.symbol.clone(),
@@ -278,10 +284,15 @@ pub async fn run(cli: &Cli) -> Result<()> {
                 {
                     Ok(result) => {
                         info!("  OOS {}", result.summary_line());
+                        if result.total_positions.unwrap_or(0) == 0 {
+                            if let Some(audit) = &result.condition_audit_summary {
+                                info!("  OOS condition audit: {}", serde_json::to_string_pretty(audit).unwrap_or_default());
+                            }
+                        }
                         oos_results.push(result);
                     }
                     Err(e) => {
-                        warn!("  OOS backtest failed for {}: {e}", inst.symbol);
+                        warn!("  OOS backtest failed for {}: {e:#}", inst.symbol);
                     }
                 }
             }

src/swym.rs

@@ -82,7 +82,7 @@ impl BacktestResult {
                 self.error_message.as_deref().unwrap_or("unknown error")
             );
         }
-        format!(
+        let mut s = format!(
             "[{}] trades={} win_rate={:.1}% pf={:.2} net_pnl={:.2} sharpe={:.2} avg_bars={:.1}",
             self.instrument,
             self.total_positions.unwrap_or(0),
@@ -91,7 +91,17 @@ impl BacktestResult {
             self.net_pnl.unwrap_or(0.0),
             self.sharpe_ratio.unwrap_or(0.0),
             self.avg_bars_in_trade.unwrap_or(0.0),
-        )
+        );
+        if self.total_positions.unwrap_or(0) == 0 {
+            if let Some(audit) = &self.condition_audit_summary {
+                let audit_str = format_audit_summary(audit);
+                if !audit_str.is_empty() {
+                    s.push_str(" | audit: ");
+                    s.push_str(&audit_str);
+                }
+            }
+        }
+        s
     }
 
     /// Is this result promising enough to warrant out-of-sample validation?
@@ -103,6 +113,35 @@ impl BacktestResult {
     }
 }
 
+/// Render a condition_audit_summary Value into a compact one-line string.
+/// Handles both object and array shapes we might receive from the API.
+fn format_audit_summary(audit: &Value) -> String {
+    match audit {
+        Value::Object(map) => map
+            .iter()
+            .map(|(k, v)| format!("{k}={v}"))
+            .collect::<Vec<_>>()
+            .join(", "),
+        Value::Array(arr) => arr
+            .iter()
+            .filter_map(|item| {
+                let name = item.get("name").or_else(|| item.get("condition"))?.as_str()?;
+                // Try common field names for hit counts
+                if let (Some(true_count), Some(total)) = (
+                    item.get("true_count").or_else(|| item.get("hit_count")).or_else(|| item.get("true_bars")).and_then(|v| v.as_u64()),
+                    item.get("total").or_else(|| item.get("total_bars")).or_else(|| item.get("evaluated")).and_then(|v| v.as_u64()),
+                ) {
+                    Some(format!("{name}: {true_count}/{total}"))
+                } else {
+                    Some(format!("{name}: {item}"))
+                }
+            })
+            .collect::<Vec<_>>()
+            .join(", "),
+        other => other.to_string(),
+    }
+}
+
 impl SwymClient {
     pub fn new(base_url: &str) -> Result<Self> {
         let client = Client::builder()