feat: add agentic search

[aamir-s18]

Note

Adds optional agentic search mode

• New CLI flag -ag, --agentic and env MGREP_AGENTIC to enable multi-search "agentic" behavior
• Passes agentic (along with rerank) via unified searchOptions to store.search and store.ask
• Extends SearchOptions in src/lib/store.ts; updates Mixedbread/Test store method signatures accordingly
• README: new "mgrep as Subagent" section and option/env docs; command table examples updated
• tsconfig: add include/exclude entries

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[aamir-s18]

bugbot run

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Cursor Bugbot has reviewed your changes and found 2 potential issues.

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