Fix PR creation system to use fallback repository

- Complete fallback logic when primary target repository doesn't exist
- Use accessible fallback repository ChrisRackauckas-Claude/LinearSolveAutotuneResults.jl
- Add detailed logging for repository selection process
- Update PR body to show which repository is being used
- Fix GitHub API calls to use proper repository references

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisRackauckas

lib/LinearSolveAutotune/src/telemetry.jl

@@ -380,6 +380,7 @@ function upload_to_github(content::String, plot_files::Union{Nothing, Tuple, Dic
 
         # Fork the repository if needed and create branch
         target_repo = "SciML/LinearSolveAutotuneResults.jl"
+        fallback_repo = "ChrisRackauckas-Claude/LinearSolveAutotuneResults.jl"
         branch_name = "autotune-results-$(folder_name)"
 
         @info "📋 Creating result folder: results/$folder_name"
@@ -388,7 +389,7 @@ function upload_to_github(content::String, plot_files::Union{Nothing, Tuple, Dic
         files_to_create = create_result_files(folder_name, content, plot_files, results_df, system_info, categories)
 
         # Create pull request with all files
-        pr_result = create_results_pr(target_repo, branch_name, folder_name, files_to_create, auth)
+        pr_result = create_results_pr(target_repo, fallback_repo, branch_name, folder_name, files_to_create, auth)
 
         if pr_result !== nothing
             @info "✅ Successfully created pull request: $(pr_result["html_url"])"
@@ -529,21 +530,40 @@ end
 
 Create a pull request with the benchmark results.
 """
-function create_results_pr(target_repo, branch_name, folder_name, files, auth)
+function create_results_pr(target_repo, fallback_repo, branch_name, folder_name, files, auth)
     try
         @info "🚧 Creating pull request with benchmark results..."
         @info "📋 Target: $target_repo, Branch: $branch_name"
         @info "📋 Files to include: $(length(files)) files"
 
-        # Split the target repo name
-        repo_parts = split(target_repo, "/")
-        if length(repo_parts) != 2
-            error("Invalid repository format: $target_repo")
-        end
-        repo_owner, repo_name = repo_parts
+        # Try target repository first, fallback if it doesn't exist
+        actual_target_repo = target_repo
+        target_repo_obj = nothing
+        repo_owner = ""
+        repo_name = ""
 
-        # Get the target repository
-        target_repo_obj = GitHub.repo(repo_owner * "/" * repo_name, auth=auth)
+        try
+            @info "📋 Trying primary target: $target_repo"
+            repo_parts = split(target_repo, "/")
+            if length(repo_parts) != 2
+                error("Invalid repository format: $target_repo")
+            end
+            repo_owner, repo_name = repo_parts
+            target_repo_obj = GitHub.repo(target_repo, auth=auth)
+            @info "✅ Primary target accessible: $target_repo"
+        catch e
+            @warn "Primary target $target_repo not accessible: $e"
+            @info "📋 Using fallback repository: $fallback_repo"
+            actual_target_repo = fallback_repo
+            
+            repo_parts = split(fallback_repo, "/")
+            if length(repo_parts) != 2
+                error("Invalid fallback repository format: $fallback_repo")
+            end
+            repo_owner, repo_name = repo_parts
+            target_repo_obj = GitHub.repo(fallback_repo, auth=auth)
+            @info "✅ Fallback target accessible: $fallback_repo"
+        end
 
         # Get authenticated user to determine source repo
         user = GitHub.whoami(auth=auth)
@@ -624,14 +644,15 @@ function create_results_pr(target_repo, branch_name, folder_name, files, auth)
             end
         end
 
-        # Create pull request
+        # Create pull request to the actual accessible repository
         pr_title = "Add benchmark results: $folder_name"
         pr_body = """
 # LinearSolve.jl Benchmark Results
 
 Automated submission of benchmark results from the LinearSolve.jl autotune system.
 
 ## System Information
+- **Repository**: $actual_target_repo
 - **Folder**: `results/$folder_name`
 - **Files**: $(length(files)) files including CSV data, plots, and system info
 - **Timestamp**: $(Dates.now())
@@ -650,6 +671,7 @@ The benchmark data will help improve algorithm selection for the community.
 🤖 Generated by LinearSolve.jl autotune system
 """
 
+        @info "📋 Creating PR to $actual_target_repo from $(user.login):$branch_name to $default_branch"
         pr_result = GitHub.create_pull_request(target_repo_obj, 
                                              title=pr_title,
                                              body=pr_body,