chore: vendor sglang v0.5.10 snapshot

third_party/sglang/docs/release_lookup/README.md

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+# SGLang Release Lookup Tool
+
+This tool allows users to find the earliest release that contains a specific PR or commit.
+It runs entirely in the browser using a static JSON index generated from the git history.
+
+## Usage
+
+1. **Generate the Index**:
+   Run the Python script to generate the `release_index.json` file from your local git repository.
+
+   ```bash
+   python3 generate_index.py --output release_index.json
+   ```
+
+   This script:
+   - Finds all tags matching `v*` and `gateway-v*`.
+   - Sorts them by creation date.
+   - Traverses the history to find which release first introduced each commit and PR.
+   - Extracts PR numbers from commit messages.
+
+2. **Open the Tool**:
+   Open `index.html` in your browser.
+
+   ```bash
+   # You can open it directly if your browser supports local file fetch (Firefox usually does),
+   # or serve it locally:
+   python3 -m http.server
+   # Then go to http://localhost:8000/index.html
+   ```
+
+## Files
+
+- `index.html`: The UI for the lookup tool.
+- `generate_index.py`: Script to build the index.
+- `release_index.json`: The index file used by the UI.
+
+## Logic
+
+The tool determines the "earliest release" based on the tag creation date. It traverses tags from oldest to newest. Any commit reachable from a tag (that wasn't reachable from a previous tag) is assigned to that release.