Commit IDs should not be spell checked

**What got flagged?**
77eb1817c797407ecd0fa2da4a6c43e723b892e3

**Why is this incorrect?**
This is a git commit ID, and there's nothing to spell check here. This is probably not trivial to detect but there could be some heuristics, e.g., based on length or the fact that only hex digits are used.

The issue names no files, tests, or entry points. Start by locating the spell-checking path that flags the example commit ID and inspect how token text is classified; done means commit IDs such as 77eb1817c797407ecd0fa2da4a6c43e723b892e3 are ignored without suppressing ordinary spell-checking, with regression coverage.

Written by the indexing model from the issue text.