refactor(common): move id/path/text/debug into utils/ submodule

Separate core type definitions (error.rs, result.rs) from utility
functions (id, path, text, debug) with a utils/ subdirectory.

Re-exports at crate root maintain backwards compatibility:
crab_common::path, crab_common::id etc. still work.

Author: lingcoder

crates/common/src/lib.rs

@@ -1,9 +1,12 @@
-pub mod debug;
 pub mod error;
-pub mod id;
-pub mod path;
 pub mod result;
-pub mod text;
+pub mod utils;
 
 pub use error::Error;
 pub use result::Result;
+
+// Re-export utils at top level for backwards compatibility
+pub use utils::debug;
+pub use utils::id;
+pub use utils::path;
+pub use utils::text;

crates/common/src/debug.rs crates/common/src/utils/debug.rscrates/common/src/debug.rs renamed to crates/common/src/utils/debug.rs

@@ -0,0 +1,4 @@
+pub mod debug;
+pub mod id;
+pub mod path;
+pub mod text;