fix(backend): prioritize git remote detection over env var for repo (#1555)

The GITHUB_REPO/GITLAB_PROJECT env vars were taking priority over
auto-detection from the project's git remote, causing all projects
to incorrectly use the hardcoded repo from .env in multi-project setups.

Changed priority order:
1. Explicit --repo/--project CLI flag (highest)
2. Auto-detect from project's git remote/config (primary)
3. Environment variable (fallback only)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

apps/backend/runners/github/runner.py

@@ -106,7 +106,12 @@ def get_config(args) -> GitHubRunnerConfig:
 
     token = args.token or os.environ.get("GITHUB_TOKEN", "")
     bot_token = args.bot_token or os.environ.get("GITHUB_BOT_TOKEN")
-    repo = args.repo or os.environ.get("GITHUB_REPO", "")
+
+    # Repo detection priority:
+    # 1. Explicit --repo flag (highest priority)
+    # 2. Auto-detect from project's git remote (primary for multi-project setups)
+    # 3. GITHUB_REPO env var (fallback only)
+    repo = args.repo  # Only use explicit CLI flag initially
 
     # Find gh CLI - use get_gh_executable for cross-platform support
     gh_path = get_gh_executable()
@@ -131,8 +136,8 @@ def get_config(args) -> GitHubRunnerConfig:
         except FileNotFoundError:
             pass  # gh not installed or not in PATH
 
+    # Auto-detect repo from project's git remote (takes priority over env var)
     if not repo and gh_path:
-        # Try to detect from git remote
         try:
             result = subprocess.run(
                 [
@@ -155,6 +160,10 @@ def get_config(args) -> GitHubRunnerConfig:
         except FileNotFoundError:
             pass  # gh not installed or not in PATH
 
+    # Fall back to environment variable only if auto-detection failed
+    if not repo:
+        repo = os.environ.get("GITHUB_REPO", "")
+
     if not token:
         safe_print(
             "Error: No GitHub token found. Set GITHUB_TOKEN or run 'gh auth login'"

apps/backend/runners/gitlab/runner.py

@@ -61,11 +61,16 @@ def print_progress(callback: ProgressCallback) -> None:
 def get_config(args) -> GitLabRunnerConfig:
     """Build config from CLI args and environment."""
     token = args.token or os.environ.get("GITLAB_TOKEN", "")
-    project = args.project or os.environ.get("GITLAB_PROJECT", "")
     instance_url = args.instance or os.environ.get(
         "GITLAB_INSTANCE_URL", "https://gitlab.com"
     )
 
+    # Project detection priority:
+    # 1. Explicit --project flag (highest priority)
+    # 2. Auto-detect from .auto-claude/gitlab/config.json (primary for multi-project setups)
+    # 3. GITLAB_PROJECT env var (fallback only)
+    project = args.project  # Only use explicit CLI flag initially
+
     if not token:
         # Try to get from glab CLI
         import subprocess
@@ -86,8 +91,8 @@ def get_config(args) -> GitLabRunnerConfig:
                     token = line.split("Token:")[-1].strip()
                     break
 
+    # Auto-detect from project config (takes priority over env var)
     if not project:
-        # Try to detect from .auto-claude/gitlab/config.json
         config_path = Path(args.project_dir) / ".auto-claude" / "gitlab" / "config.json"
         if config_path.exists():
             try:
@@ -100,6 +105,10 @@ def get_config(args) -> GitLabRunnerConfig:
             except Exception as exc:
                 print(f"Warning: Failed to read GitLab config: {exc}", file=sys.stderr)
 
+    # Fall back to environment variable only if auto-detection failed
+    if not project:
+        project = os.environ.get("GITLAB_PROJECT", "")
+
     if not token:
         print(
             "Error: No GitLab token found. Set GITLAB_TOKEN or configure in project settings."