whetstone_DSL/tmp_eval_complex_specs_20260303/fs_005_rust.md

Feature Flagged Search Rewrite (fs_005)

Objective

Replace search ranking pipeline behind feature flag with staged rollout, telemetry checks, and automatic abort trigger.

Language & Library Constraints

• Primary language: rust
• Available libraries: axum, serde, tokio
• Prefer explicit use of selected library APIs in task execution contracts.

Required Artifacts

• search/core.rs
• search/ranking.rs
• flags/config.rs
• telemetry/search_metrics.rs
• rollback_plan.md

Acceptance

• Generate deterministic taskitems with strict execution contracts.
• Include selected library and preferred APIs per task where applicable.