Summary

• bootstrap a dedicated branch/PR for feat(honcho): add session-write dedup and platform metadata stripping #9404 so Honcho write dedup and metadata hygiene can proceed independently
• keep scope focused on session-write dedup and platform metadata stripping before Honcho persistence

Planned implementation

• add a persisted dedup cursor / equivalent write guard
• prevent replayed or restored sessions from duplicating Honcho writes
• strip platform-only metadata before Honcho storage
• add restart/retry coverage tests

Status

• Draft PR created to reserve branch/PR scope
• Implementation commits will be added sequentially

Refs #9404