Method resolveProjectTrunkBranch

src/node/services/workspaceService.ts:3435–3468

(projectPath: string)

      initLogger = this.createInitLogger(workspaceId);

      const resolveProjectTrunkBranch = async (projectPath: string): Promise<string> => {
        if (isLocalRuntime) {
          return normalizedPreferredTrunkBranch ?? "";
        }

        if (!normalizedPreferredTrunkBranch) {
          const localBranches = await listLocalBranches(projectPath);
          return detectDefaultTrunkBranch(projectPath, localBranches);
        }

        try {
          const localBranches = await listLocalBranches(projectPath);
          if (localBranches.includes(normalizedPreferredTrunkBranch)) {
            return normalizedPreferredTrunkBranch;
          }

          const detectedTrunkBranch = await detectDefaultTrunkBranch(projectPath, localBranches);
          log.debug("Requested multi-project trunk branch missing; using detected branch", {
            projectPath,
            requestedTrunkBranch: normalizedPreferredTrunkBranch,
            detectedTrunkBranch,
          });
          return detectedTrunkBranch;
        } catch (error: unknown) {
          // When branch discovery is unavailable, preserve the caller-provided branch.
          // This mirrors single-project create() behavior for non-local runtimes.
          log.debug("Failed to detect per-project trunk branch; using requested branch", {
            projectPath,
            requestedTrunkBranch: normalizedPreferredTrunkBranch,
            error: getErrorMessage(error),
          });
          return normalizedPreferredTrunkBranch;
        }
      };
      const projectRuntimeEntries = normalizedProjects.map((project) => ({
        project,
        runtime: createRuntime(finalRuntimeConfig, {