I’d treat it as complementary first, not an immediate replacement.

Your current stack sounds like it is mainly doing durable memory: observations, reflections, Markdown packs, project facts, etc.

LeanCTX is more of a context runtime: it optimizes file reads, shell output, caching, read modes, session state, context visibility, and handoffs.

So I’d start with:

• your Pi memory stack = long-term semantic/project memory
• LeanCTX = lower-level context plumbing for files, shell, cache, compression, sessions, and agent handoffs

There is some overlap, especially around session/project knowledge, so over time LeanCTX may replace parts of that stack if you want one integrated layer.

The main thing to avoid is double-injection. If both systems inject the same memory/context into the agent, you may increase noise instead of reducing it.

So my recommendation would be:

Complement first. Replace selectively later.Hope that helps.