feat: add persistent CPU search engine and CLI with lifecycle tests

AGENTS.md

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+# Searchi development
+
+- All tests in the Windows VM must use CPU only. Never enable GPU providers here.
+- Keep the Rust engine independent of the desktop shell; CLI and UI share its API.
+- Use bounded work, explicit errors, versioned storage, and offline defaults.
+- Never substitute simulated embeddings for working semantic search.
+- Add meaningful tests for retrieval, persistence, and filesystem lifecycle changes.
+- Keep docs/ROADMAP.md current. Unexecuted platform checks remain unchecked.
+- Agents own assigned paths and must coordinate shared interface changes. Do not commit other agents' unfinished work.