feat(hooks): the merge question says how the run was tested and how it is undone

hooks/scripts/pre-bash-executor.mjs

@@ -779,13 +779,32 @@ if (approvals.length > 0) {
   const unlogged = loggable.length > 0 && !recorded
     ? ' Note: this approval will not be logged (Voyage could not record the question).' : '';
   const advisory = (warnings.length > 0 ? ` Advisory: ${warnings.map((w) => w.trim()).join(' ')}` : '') + unlogged;
-  process.stdout.write(JSON.stringify({
+  const answer = {
     hookSpecificOutput: {
       hookEventName: 'PreToolUse',
       permissionDecision: 'ask',
       permissionDecisionReason: askReason(approvals) + advisory,
     },
-  }));
+  };
+  // BEGIN merge-evidence
+  // A merge into main also says how the run was tested and how it is undone,
+  // read from the evidence file /trekexecute Phase 8 wrote (hooks/lib/merge-evidence.mjs).
+  // The decision above is already 'ask'; this block only adds text to the
+  // reason, and a reader that fails to load or throws leaves a note, never a
+  // green line.
+  const merge = approvals.find((m) => m.cls === 'merge');
+  if (merge) {
+    let evidence;
+    try {
+      const { evidenceLines } = await import('../lib/merge-evidence.mjs');
+      evidence = ' ' + evidenceLines(merge.subject, merge.merge && merge.merge.args);
+    } catch {
+      evidence = ' (run evidence not loaded)';
+    }
+    answer.hookSpecificOutput.permissionDecisionReason += evidence;
+  }
+  // END merge-evidence
+  process.stdout.write(JSON.stringify(answer));
 }
 
 process.exit(0);