Snippet highlight case mismatch with scoring

[krwg]

Summary

Snippets miss matches that scoring finds in mixed-case bodies.

Target milestone: 2.8.5
Work branch: 2.8.5/issue-4-snippet-case

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Problem

findSnippetInBlob searches original-case blob; scoring lowercases bags. Mixed-case notes can score but show empty/wrong snippets.

Expected behavior

Snippet extraction uses same normalization as scoring.

Suggested approach

Lowercase blob before variant search or search case-insensitively with correct highlight offsets.

Files / areas

• lib/engine.js → findSnippetInBlob (~155–160)

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Acceptance criteria

• Vitest: mixed-case body returns snippet when token matches

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Metadata

Field	Value
Priority	P1
Milestone	2.8.5
Branch	2.8.5/issue-4-snippet-case