docs(positioning): scrub nationality framing per brand canon

[satyakwok]

Why

Sentrix public positioning is dev-focused factual: "Open source EVM L1 in Rust". Two README lines still carried the legacy "Indonesian Layer 1" framing.

What

• `README.md:3` — header tagline: "Indonesian Layer 1 Blockchain" → "open source EVM L1 in Rust"
• `README.md:117` — naming-convention disambiguation line: same scrub

Test plan

• Visual diff renders cleanly in GitHub markdown preview

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