Update ARCHITECTURE.md for share-based ERC-4626 model

[devsimze]

Problem

ARCHITECTURE.md still describes Phase 1 as 1:1 balance accounting without shares.

Scope

• ARCHITECTURE.md

Acceptance criteria

• Document shares, TotalAssets, rounding, and Blend deployment.
• Remove outdated Phase 1-only sections or mark historical.

[Ericoluchukwu]

@Ericoluchukwu has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I will like to work on this issues because I'm a developer, I understood it

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[divysam]

@divysam has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello
I would love to work on this issue please

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[aymide1ee]

@aymide1ee has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, I would love to work on this issue.

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[covenantalade]

@covenantalade has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Let me work on this

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[drips-wave]

Congratulations, @covenantalade! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @covenantalade: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

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Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #293)
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