Applied a more general bugfix to path-resolution issues in the archive stage

internal/stage/archive.go

@@ -125,7 +125,8 @@ func (archiveStage) Run(ctx context.Context, env *Env, m *manifest.Manifest) (*S
 	if err != nil {
 		return nil, fmt.Errorf("archive: collect run files: %w", err)
 	}
-	promotions, err := resolveArchivePromotions(workDir, env.Config.Pipeline.Archive.PromoteArtifacts)
+	workDirCandidates := archiveSourceWorkDirs(env, m, workDir)
+	promotions, err := resolveArchivePromotions(workDirCandidates, env.Config.Pipeline.Archive.PromoteArtifacts)
 	if err != nil {
 		return nil, fmt.Errorf("archive: resolve promotion rules: %w", err)
 	}
@@ -330,22 +331,38 @@ func archiveBucket(env *Env, m *manifest.Manifest) string {
 	return strings.TrimSpace(env.Config.Pipeline.Storage.S3.Bucket)
 }
 
-func resolveArchivePromotions(workDir string, rules []config.ArchivePromotionRule) ([]archivePromotion, error) {
+func resolveArchivePromotions(workDirs []string, rules []config.ArchivePromotionRule) ([]archivePromotion, error) {
+	if len(workDirs) == 0 {
+		return nil, fmt.Errorf("at least one workdir candidate is required")
+	}
 	out := make([]archivePromotion, 0, len(rules))
 	for _, rule := range rules {
 		from := strings.TrimSpace(rule.From)
 		to := strings.TrimSpace(rule.To)
 		required := rule.Required == nil || *rule.Required
 
-		localPath, err := resolveWorkDirRelativePath(workDir, from)
+		var (
+			localPath string
+			exists    bool
+		)
+		for _, candidateRoot := range workDirs {
+			resolvedPath, err := resolveWorkDirRelativePath(candidateRoot, from)
 			if err != nil {
 				return nil, fmt.Errorf("promotion from %q: %w", from, err)
 			}
-		info, err := os.Stat(localPath)
+			info, err := os.Stat(resolvedPath)
-		exists := err == nil && !info.IsDir()
+			if err == nil && !info.IsDir() {
+				localPath = resolvedPath
+				exists = true
+				break
+			}
 			if err != nil && !os.IsNotExist(err) {
 				return nil, fmt.Errorf("promotion source %q: %w", from, err)
 			}
+			if localPath == "" {
+				localPath = resolvedPath
+			}
+		}
 
 		out = append(out, archivePromotion{
 			From:      from,
@@ -358,6 +375,33 @@ func resolveArchivePromotions(workDir string, rules []config.ArchivePromotionRul
 	return out, nil
 }
 
+func archiveSourceWorkDirs(env *Env, m *manifest.Manifest, runWorkDir string) []string {
+	candidates := make([]string, 0, 2)
+	if strings.TrimSpace(runWorkDir) != "" {
+		candidates = append(candidates, filepath.Clean(runWorkDir))
+	}
+	sessionID := strings.TrimSpace(env.Config.Session.SessionID)
+	if sessionID == "" && m != nil {
+		sessionID = strings.TrimSpace(m.SessionID)
+	}
+	if sessionID != "" {
+		sessionWorkDir := filepath.Clean(artifacts.SessionWorkDir(env.Config.Pipeline.Workspace.Root, sessionID))
+		if sessionWorkDir != "" {
+			candidates = append(candidates, sessionWorkDir)
+		}
+	}
+	seen := make(map[string]struct{}, len(candidates))
+	out := make([]string, 0, len(candidates))
+	for _, c := range candidates {
+		if _, ok := seen[c]; ok {
+			continue
+		}
+		seen[c] = struct{}{}
+		out = append(out, c)
+	}
+	return out
+}
+
 func resolveWorkDirRelativePath(workDir, rel string) (string, error) {
 	rel = filepath.Clean(filepath.FromSlash(strings.TrimSpace(rel)))
 	if rel == "." || rel == "" {

internal/stage/archive_test.go

@@ -3,6 +3,7 @@ package stage
 import (
 	"context"
 	"errors"
+	"os"
 	"path/filepath"
 	"reflect"
 	"strings"
@@ -182,6 +183,29 @@ func TestArchiveFailsWhenRequiredPromotionMissing(t *testing.T) {
 	}
 }
 
+func TestArchivePromotionFallsBackToSessionWorkDir(t *testing.T) {
+	env, m, runWorkDir := archiveFixture(t)
+	sessionWorkDir := artifacts.SessionWorkDir(env.Config.Pipeline.Workspace.Root, m.SessionID)
+	sessionTrimmed := filepath.Join(sessionWorkDir, "transcripts", "trimmed.json")
+
+	if err := os.Remove(filepath.Join(runWorkDir, "transcripts", "trimmed.json")); err != nil {
+		t.Fatalf("remove run scoped trimmed transcript: %v", err)
+	}
+	writeStageTestFile(t, sessionTrimmed, "{}\n")
+
+	result, err := archiveStage{}.Run(context.Background(), env, m)
+	if err != nil {
+		t.Fatalf("Run() error = %v", err)
+	}
+	if result.Metadata["promoted_files_uploaded"] != 2 {
+		t.Fatalf("metadata promoted_files_uploaded = %#v, want 2", result.Metadata["promoted_files_uploaded"])
+	}
+	fake := env.ObjectStore.(*storage.FakeBackend)
+	if _, ok := fake.Objects[m.S3SessionPrefix+"transcripts/trimmed.json"]; !ok {
+		t.Fatalf("missing promoted trimmed key from session fallback")
+	}
+}
+
 func TestArchiveDoesNotWriteCurrentPointerWhenPromotionUploadFails(t *testing.T) {
 	env, m, _ := archiveFixture(t)
 	fake := env.ObjectStore.(*storage.FakeBackend)