Pattern: Context and Memory Management Is Migrating Out of the Vendor and Into a Local Binary You Control

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Three independently built projects converged this week on the same architecture: put context handling in a user-run local process rather than trusting the agent's built-in compaction. LeanCTX is a Rust binary that proxies the wire and decides what the agent may read; MemPalace is local-first with zero API calls and explicitly hooks in before compaction fires; claude-mem captures everything a session does, compresses it, and re-injects on the next run. All three treat vendor auto-compaction as the lossy step to route around, not the solution. For builders, the practical read is that 'context engineering' has become a deployable component with its own benchmarks and process boundary — not a prompt-writing skill.