Fix PR body newlines rendering as literal \n

Bash double-quoted strings don't interpret \n as newlines.
Use actual newlines in the pr_body strings instead.

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

lib/sync.sh

@@ -122,7 +122,14 @@ ${BOT_TRAILER}: forward/${mono_branch}/$(date -u +%Y-%m-%dT%H:%M:%SZ)" >&2
     local pr_body conflicted_list
     # shellcheck disable=SC2001
     conflicted_list=$(echo "$conflicted" | sed 's/^/- /')
-    pr_body="## Sync Conflict\n\nMonorepo \`${mono_branch}\` has changes that conflict with \`${subrepo_branch}\`.\n\n**Conflicted files:**\n${conflicted_list}\n\nPlease resolve and merge this PR to complete the sync."
+    pr_body="## Sync Conflict
+
+Monorepo \`${mono_branch}\` has changes that conflict with \`${subrepo_branch}\`.
+
+**Conflicted files:**
+${conflicted_list}
+
+Please resolve and merge this PR to complete the sync."
 
     create_pr "${SUBREPO_API}" "${SUBREPO_TOKEN}" \
       "$subrepo_branch" "$conflict_branch" \
@@ -281,7 +288,18 @@ reverse_sync() {
 
     # 5. Create PR on monorepo (NEVER direct push)
     local pr_body
-    pr_body="## Subrepo changes\n\nNew commits from subrepo \`${subrepo_branch}\`:\n\n\`\`\`\n${human_commits}\n\`\`\`\n\n**Review checklist:**\n- [ ] Changes scoped to synced subfolder\n- [ ] No leaked credentials or environment-specific config\n- [ ] CI passes"
+    pr_body="## Subrepo changes
+
+New commits from subrepo \`${subrepo_branch}\`:
+
+\`\`\`
+${human_commits}
+\`\`\`
+
+**Review checklist:**
+- [ ] Changes scoped to synced subfolder
+- [ ] No leaked credentials or environment-specific config
+- [ ] CI passes"
 
     create_pr "${MONOREPO_API}" "${GITEA_TOKEN}" \
       "$mono_branch" "$staging_branch" \
@@ -369,7 +387,14 @@ ${BOT_TRAILER}: import/${JOSH_SYNC_TARGET_NAME}/${ts}" >&2
 
   # 5. Create PR on monorepo
   local pr_body
-  pr_body="## Initial import\n\nImporting existing subrepo \`${subrepo_branch}\` (${file_count} files) into \`${subfolder}/\`.\n\n**Review checklist:**\n- [ ] Content looks correct\n- [ ] No leaked credentials or environment-specific config\n- [ ] CI passes"
+  pr_body="## Initial import
+
+Importing existing subrepo \`${subrepo_branch}\` (${file_count} files) into \`${subfolder}/\`.
+
+**Review checklist:**
+- [ ] Content looks correct
+- [ ] No leaked credentials or environment-specific config
+- [ ] CI passes"
 
   create_pr "${MONOREPO_API}" "${GITEA_TOKEN}" \
     "$mono_branch" "$staging_branch" \