Add sources section to LinearSolveAutotune Project.toml

Add [sources] section with paths to LinearSolveAutotune and LinearSolve packages
for proper local development setup.

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

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

Author: claude

lib/LinearSolveAutotune/Project.toml

@@ -3,6 +3,10 @@ uuid = "67398393-80e8-4254-b7e4-1b9a36a3c5b6"
 authors = ["SciML"]
 version = "1.8.0"
 
+[sources]
+LinearSolveAutotune = {path = "."}
+LinearSolve = {path = "../.."}
+
 [deps]
 Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
 BenchmarkTools = "6e4b80f9-dd63-53aa-95a3-0cdb28fa8baf"