Update index.mdx

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What changed? Why?

Notes to reviewers

How has it been tested?

[cb-heimdall]

🟡 Heimdall Review Status

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Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[kenn613-gif]

What changed? Why?

• Updated and completed the normative B20 specification document (index.mdx).
• Added technical details covering precompile architecture and addresses, access control and role models, policy scopes and registry integration, core extensions (memos, supply caps, granular pausing, ERC-2612 permit), token variants (Asset vs. Stablecoin), and factory deployment interfaces.

Notes to reviewers

• Aligns the documentation with the Beryl standard for Base native tokens.

How has it been tested?

• Previewed MDX markup rendering and formatting directly in the editor.