feat: improve PR body with context, source link, and cleaner signature

- Add triage plan as Context section when available
- Add source link (Sentry/Asana/Linear/Jira) with label
- Cleaner signature matching Claude Code style

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

Author: adriandmitroca

src/daemon.ts

@@ -992,24 +992,39 @@ export class Daemon {
 function buildPRBody(row: IssueRow): string {
   const lines: string[] = [];
 
-  if (row.externalUrl) {
-    lines.push("## Source");
-    lines.push(row.externalUrl);
+  // Summary
+  lines.push("## Summary");
+  if (row.fixSummary) {
+    lines.push(row.fixSummary);
+  } else {
+    lines.push(`Automated fix for: ${row.title}`);
+  }
+  lines.push("");
+
+  // Context — triage plan if available
+  if (row.triagePlan) {
+    lines.push("## Context");
+    lines.push(row.triagePlan);
     lines.push("");
   }
 
-  lines.push("## Summary");
-  lines.push(row.fixSummary ?? "Automated changes.");
-  lines.push("");
+  // Source link
+  if (row.externalUrl) {
+    const sourceLabel = row.source.charAt(0).toUpperCase() + row.source.slice(1);
+    lines.push(`**${sourceLabel}:** ${row.externalUrl}`);
+    lines.push("");
+  }
 
+  // Test plan
   lines.push("## Test plan");
   lines.push("- [ ] Verify the changes resolve the issue");
-  lines.push("- [ ] Run existing tests");
-  lines.push("- [ ] Manual QA");
+  lines.push("- [ ] Existing tests pass");
+  lines.push("- [ ] Manual QA if applicable");
   lines.push("");
 
+  // Signature
   lines.push("---");
-  lines.push("🤖 Generated with [Claude Code](https://claude.com/claude-code) · Enhanced by [Relay](https://github.com/adriandmitroca/relay)");
+  lines.push("🤖 Generated with [Relay](https://github.com/adriandmitroca/relay) using [Claude Code](https://claude.com/claude-code)");
 
   return lines.join("\n");
 }