Map NodeMem to canonical runtime events

[HomenShum]

Outcome

Restacks NodeMem's truthful NodeKit L1/L2 brownfield map directly on the merged P0 contract.

• keeps NodeMem a provider-neutral memory implementation, not another runtime
• declares consumption of nodeagent.event/v1 and ProofLoop certification
• fixes the broken dev command to run the actual TypeScript demo in watch mode
• broadens the proof alias to include core, in-memory, and Convex schema-only smoke lanes
• documents that the event adapter and canonical receipt wrapper are still missing

Proof

• NodeKit repository conformance: pass against the coordinated registry
• deterministic demo: 13/13
• secret scan: pass
• core smoke: 13/13
• in-memory smoke: 10/10
• Convex schema smoke: 7/7
• Vitest: 27/27
• TypeScript build: pass
• git diff --check: pass

Dependency status

The branch's local product proof and security checks pass. Hosted node-platform / conformance fetches node-platform/main and is expected to remain red until the event-consumer ownership in node-platform #4 lands.

Boundary

The Convex lane validates schema shape only; it is not a deployment proof. This PR does not publish npm or implement the event translator.

Supersedes #2, whose pre-P0 base became conflicting after P0 merged.