Codex/emergent local brain

[SignalLayerLabs]

Problem

What limitation or failure does this PR address?

Change

What changed, and in which layer?

Authority boundary

• Canonical mutation still flows only through the Sovereign World runtime.
• Observer-only logic does not write back into world state.
• AI output remains a proposal subject to deterministic validation.
• Human-linked identity does not import Earth knowledge into Citizens.

Evidence

node --test tests/test_sovereign_*.mjs
bash CHECK.sh . --skip-browser

For Observer changes:

bash CHECK.sh .

Operational impact

Describe any effect on Durable Object writes, alarms, SQLite, Workers AI, D1, Cloudflare bindings, WebSockets or deployment order.

Screenshots / traces

For visual changes, include before/after evidence. For canonical changes, include invariant output or causal evidence.