Memento Tab

Description

Session-scoped memory tab for DeepSeek Harness, rendered beside Chat / Trajectory / Context, covering the whole /memory surface (list, query, add, rewrite, remove, merge, proposals, budgets, audit, adapters, export, import). A companion to dsh-memento: it consumes the public ctx.memory seam and registers its own routes, so it never forks upstream. Reading the tab never increments the store's recall counters. Every route call carries a deadline, so a wedged request reports a failure instead of locking the tab. Removes address entries by primary key, so two memories with identical text stay individually deletable.