Fix broken bench: add missing test_context field to WeakPoint literal (#132)

## Problem

`cargo bench` fails to compile (and so does any `cargo check
--all-targets`):

```
benches/scan_bench.rs:197: error[E0063]: missing field `test_context`
                           in initializer of `WeakPoint`
```

`WeakPoint` gained `pub test_context: Option<TestContext>` in v2.5.5
(`src/types.rs:325`), but the `WeakPoint { … }` literal in the
`bench_location_extraction` benchmark was never updated. This is a
**live**
break, not latent: `.github/workflows/e2e.yml` runs `cargo bench`.

The library and binaries are unaffected — this was the only error.

## Fix

Add `test_context: None,` to the benchmark's `WeakPoint` initializer.

## Verification

`cargo check --benches` → `Finished` (clean; only the two pre-existing
library warnings remain).

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

https://claude.ai/code/session_0196movYBRwNw8vkLRaaFoTu

---
_Generated by [Claude
Code](https://claude.ai/code/session_0196movYBRwNw8vkLRaaFoTu)_

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

Author: hyperpolymath

benches/scan_bench.rs

@@ -203,6 +203,7 @@ fn bench_location_extraction(c: &mut Criterion) {
             description: "test".to_string(),
             recommended_attack: vec![],
             suppressed: false,
+            test_context: None,
         };
         100
     ];