Publish DreamNet Whitepaper v0.2 and receipt-routing architecture

[BrandonDucar]

Summary

• publishes the canonical public DreamNet Whitepaper v0.2
• updates the architecture across Capsules, DreamLoops, adaptive quorum, Claim Factory, receipts, GitGrid, Cerberus, Proof Drops, and Temporal workers
• defines green/yellow/red fail-closed Receipt Router behavior
• refreshes public/private boundaries and ecosystem links
• pins CI actions to immutable commit SHAs

Verification

• initial Cerberus verdict: ORANGE due to two tag-pinned GitHub Actions; execution blocked
• remediation: pinned checkout and setup-node to full commit SHAs
• final Cerberus verdict: GREEN, risk 0/100
• final content digest: sha256:2a218159b1ec2e77808f09b745711a84144ba9c1cab5142abea89473b3ab6784
• npm run verify: TypeScript check passed, 3 tests passed, build passed

This PR documents the exact color-based workflow pivot discussed during the NUC Temporal rollout.