Add native cleanup runtime with JS fallback

[TrueNine]

Summary

• add a Rust cleanup implementation and native binding bridge for CLI cleanup flows
• keep a JavaScript fallback path and extend plugin cleanup integration/tests
• add native smoke and benchmark scripts for the new cleanup path

Validation

• pnpm run build:native
• pnpm run build
• pnpm run lint
• pnpm run typecheck
• pnpm run test
• cargo test --workspace --exclude memory-sync-gui --lib --bins --tests

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Project	Deployment	Actions	Updated (UTC)
memory-sync-doc	Ready	Preview, Comment	Mar 27, 2026 7:19pm