fix: rank word-start matches higher for autocomplete

[ocavue]

A query that starts any word of a title (smith in John Smith) now ranks like a title prefix, above a mid-word match such as Blacksmithing. Stacked on #1317.

Summary by CodeRabbit

• Improvements

  • Search suggestions now rank exact matches first.
  • Matches beginning at word boundaries—such as after spaces or punctuation—appear ahead of matches found in the middle of words.
  • This produces more relevant suggestion ordering for multi-word and punctuated queries.

• Tests

  • Added coverage for word-start, later-word, punctuation, and mid-word matching scenarios.

[coderabbitai]

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📒 Files selected for processing (2)

• packages/core/src/indexing/suggest.test.ts
• packages/core/src/indexing/suggest.ts

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