hotfix(v6.4.20260420): rewrite README in brand voice and enrich branding.md

[nullhack]

Summary

Hotfix for v6.4.20260420 - Minimal Prometheus.

• README: rewrites all prose in the direct, precise brand voice; drops banned word scaffold; updates tagline to "From zero to hero — production-ready Python, without the ceremony."; adds @designer to agents table; adds Branding section explaining docs/branding.md to template users; updates versioning line to reflect configurable convention
• docs/branding.md: enriches every field with Greek-antiquity theme flavouring — colour descriptions carry meaning, tone of voice demonstrates itself, release naming rationale cites the intellectual lineage claim with precise wording, wording section references kenophonia