False positive: "Basics" should not be lowercased at the start of a sentence

**What got flagged?**
`Basics for new users:` → The canonical dictionary spelling is `basics`. Harper: OrthographicConsistency

**Why is this incorrect?**
At the start of a sentence, the word "Basics" should be uppercased.

Search the Rust implementation and tests for the OrthographicConsistency rule, then reproduce the reported `Basics for new users:` case. Trace why a sentence-initial word is compared against the canonical lowercase spelling. Done means this capitalization no longer produces a false positive while genuine orthographic inconsistencies remain flagged.

Written by the indexing model from the issue text.