Summary

This is the follow up of the revert from #18097 where only the schema changes have been reverted.

This applies it back.

Greptile Summary

Re-applies the schema UI metadata (help text and display labels) for MMR re-ranking and temporal decay config keys under agents.defaults.memorySearch.query.hybrid, which were previously reverted as part of PR #18097.

• Adds 4 help text entries in schema.help.ts for mmr.enabled, mmr.lambda, temporalDecay.enabled, and temporalDecay.halfLifeDays
• Adds 4 corresponding display labels in schema.labels.ts
• All config key paths, default values, and descriptions are consistent with the existing Zod schema (zod-schema.agent-runtime.ts), TypeScript types (types.tools.ts), and implementation code (memory/mmr.ts, memory/temporal-decay.ts, memory/hybrid.ts, agents/memory-search.ts)
• No issues found; this is a clean re-application of previously reverted metadata-only changes

Confidence Score: 5/5

• This PR is safe to merge — it only adds static UI metadata (help text and labels) for config keys that are already fully defined in the schema and implemented in the codebase.
• The changes are purely additive, static string entries in two metadata files. All config key paths match the existing Zod schema and TypeScript type definitions exactly. The implementation code for MMR and temporal decay is already present and working. No logic, no runtime behavior, and no API surface is changed.
• No files require special attention.

_{Last reviewed commit: 4e329b2}