From 497c91b845de4f42732ee6520968c9d29349ab47 Mon Sep 17 00:00:00 2001
From: Fusion <noreply@runfusion.ai>
Date: Sat, 9 May 2026 09:09:05 -0700
Subject: [PATCH] fix(FN-3842): log pre-attempt baseline at in-merge finalize

---
 packages/engine/src/merger.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/engine/src/merger.ts b/packages/engine/src/merger.ts
index e477aae5c..752a14d30 100644
--- a/packages/engine/src/merger.ts
+++ b/packages/engine/src/merger.ts
@@ -5127,6 +5127,8 @@ export async function aiMergeTask(
               // amend if AI agent already committed). Always rewrites the
               // message deterministically from branch step commits.
               const authorArg = getCommitAuthorArg(settings);
+              const { stdout: finalizeHeadOut } = await execAsync("git rev-parse HEAD", { cwd: rootDir, encoding: "utf-8" });
+              mergerLog.log(`${taskId}: in-merge fix entering with preAttemptHeadSha=${preAttemptHeadSha}, currentHead=${finalizeHeadOut.trim()}`);
               const finalized = await commitOrAmendMergeWithFixes(
                 rootDir,
                 taskId,
@@ -5246,6 +5248,8 @@ export async function aiMergeTask(
 
           if (fixSuccess) {
             const authorArg = getCommitAuthorArg(settings);
+            const { stdout: finalizeHeadOut } = await execAsync("git rev-parse HEAD", { cwd: rootDir, encoding: "utf-8" });
+            mergerLog.log(`${taskId}: in-merge fix entering with preAttemptHeadSha=${preAttemptHeadSha}, currentHead=${finalizeHeadOut.trim()}`);
             const finalized = await commitOrAmendMergeWithFixes(
               rootDir,
               taskId,