fix: circular import; extract REFERENCE to own namespace

[myelinated-wackerow]

Description

• Fixes circular import logic introduced in dc32e51
• Moves REFERENCE constant to own namespace; updates imports

Alternatively could've re-exported, but this assigns the "@id" reference data to it's own namespace for clarity.

Related Issue

Before:

• organizations.ts imports REFERENCE from constants.ts
• organizations.ts exports KNOWN_ORGANIZATIONS, which uses REFERENCE
• constants.ts declares REFERENCE, but imports KNOWN_ORGANIZATIONS

pnpm build passing locally

Note: image placeholder generated from build process and committed unintentionally, but will keep in as innocuous addition that we should have anyway

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