fix: surface search hit titles instead of dropping them

[ayushsingh82]

Summary

Another of the smaller gaps flagged in #86 that isn't covered by #83.

search()'s mapper never included title, even though getProfile()'s mapper already does. But it turns out neither formatSearchResults() (used by search-memory.cjs) nor formatContext() (used for the injected recall context) ever read .title in the first place — so titles were being silently dropped in every path, including the one where the field was already being mapped. Titles are generated from the first line of saved content and are currently the only thing that could disambiguate two similar-looking results, per the original report.

This PR:

• adds title: r.title to search()'s mapper, for parity with getProfile()
• makes formatSearchResults() and formatContext() actually prefix a result line with its title when present (Title: memory text [pct%]), and leaves output unchanged when there's no title

Test plan

• npm test passes, including new cases in test/unit.mjs:
  • formatSearchResults labels a hit with its title when present
  • formatSearchResults output is unchanged when there's no title
  • formatContext's "Relevant Memories" section also picks up the title
• npm run lint passes
• plugin/scripts/*.cjs rebuilt via npm run build and committed alongside the src/ changes

[ayushsingh82]

@Dhravya fixes search hit titles being silently dropped. Please take a look.