Typo in docs directory name: tool-tranjectory-metrics

## Description

The docs directory `docs/tool-tranjectory-metrics/` contains a typo — "tranjectory" should be "trajectory".

```
docs/tool-tranjectory-metrics/
├── tool-args-match.mdx
├── tool-call-accuracy.mdx
├── tool-sequence.mdx
└── _meta.json
```

## Suggested Fix

Rename to `docs/tool-trajectory-metrics/` and update any internal references or `_meta.json` links.