Using something similar in my OpenClaw setup — hierarchical memory with L1/L2/L3 layers plus a "fiscal" agent that audits before writes. The gate is definitely the right abstraction.

One thing I've noticed: the "distillation" decision (what deserves L2 vs stays in L1) benefits from a second opinion. I have my fiscal check summaries against a simple rubric: "Does this change future behavior?" If yes, promote. If no, compact and discard.

Curious if you've experimented with read-time context injection vs just the write gate? I've found pulling relevant L2 into prompt context at session start helps continuity, but there's a tradeoff on token burn.

Great work — this feels like table stakes infrastructure for 2026 agents.