Problem

crates/zeph-tools/src/search_code.rs uses the async-trait crate for SemanticSearchBackend and LspSearchBackend traits (3 occurrences). This contradicts the Edition 2024 rule: native async traits should be used everywhere.

Proposed Changes

1. Remove #[async_trait] from SemanticSearchBackend and LspSearchBackend trait definitions
2. Convert async fn declarations to use impl Future<Output = ...> + Send return position syntax if object safety is needed, or keep async fn if concrete dispatch is sufficient
3. Update all implementations
4. Remove async-trait from zeph-tools/Cargo.toml if no other usages remain

Note on zeph-acp

The zeph-acp crate also uses #[async_trait::async_trait(?Send)] in ~18 places. This is likely required by the agent-client-protocol SDK which defines traits using this macro. That usage should be documented as an accepted exception rather than removed.

Files

• crates/zeph-tools/src/search_code.rs
• crates/zeph-tools/Cargo.toml