Add feature grading script and report generation

- Introduced `grade_features.py` script to automate feature scoring based on implementation evidence.
- Created `feature_grading.md` report summarizing feature completion across project phases.
- Updated `README.md` in tests directory to include new test cases and improve documentation clarity.
- Added new test coverage sections for recently introduced crates: `codegraph-queue`, `codegraph-git`, `codegraph-lb`, `codegraph-concurrent`, and `codegraph-zerocopy`.
- Updated `.rustc_info.json` to reflect the latest Rust compiler information.

Author: jruokola

Cargo.lock

@@ -126,6 +126,10 @@ hyper = "1.0"
 http = "1.1"
 prometheus = { version = "0.13", features = ["process"] }
 
+# OpenAPI / Swagger documentation for Axum
+utoipa = { version = "4", features = ["axum_extras", "uuid", "chrono"] }
+utoipa-swagger-ui = { version = "7", features = ["axum"] }
+
 # Memory leak detection and tracking (optional, feature-gated in binaries)
 memscope-rs = "0.1.4"