docs: proposal 12 with Arachnid Deterministic Deployment Proxy

[jhelison]

Description

Add proposal 12 with Arachnid Deterministic Deployment Proxy

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Documentation (updates documentation on the project)
• chore (Updates on dependencies, gitignore, etc)
• test (For updates on tests)

How Has This Been Tested?

Tested locally

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• kiichain/proposals/proposal_12.json

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Pull request overview

Adds proposal 12 to register Arachnid’s deterministic deployment proxy as an EVM preinstall.

Changes:

• Replaces the software upgrade message with MsgRegisterPreinstalls.
• Adds the canonical proxy address and bytecode.
• Updates proposal metadata and deposit.

File summaries

File	Description
kiichain/proposals/proposal_12.json	Defines the deterministic deployment proxy registration proposal.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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