Bump soroban_sdk and docs fixes

[brozorec]

Summary by CodeRabbit

• Documentation

  • Clarified Confidential Token compliance documentation regarding account freeze behavior and which accounts are checked during operations.
  • Standardized design documentation formatting and presentation of contract-bound address field identifiers.
  • Updated UltraHonk verifier module backend repository references.

• Chores

  • Updated Soroban SDK dependency to version 26.1.0.

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Walkthrough

This PR updates the confidential token system with a soroban-sdk dependency bump to 26.1.0, migrates UltraHonk backend documentation links to the NethermindEth repository, clarifies compliance documentation on freeze scope targeting, and standardizes DESIGN documentation formatting by escaping address field identifiers throughout.

Changes

Confidential Token Updates

Layer / File(s)	Summary
Soroban SDK dependency version bump Cargo.toml	Workspace dependency on soroban-sdk is updated from version 26.0.0 to 26.1.0 with existing features preserved.
UltraHonk backend documentation migration packages/tokens/src/confidential/README.md, packages/tokens/src/confidential/verifier/mod.rs	Module-level and README documentation links for the rs-soroban-ultrahonk backend are updated from the Oghma organization to the NethermindEth organization.
Compliance documentation clarification packages/tokens/src/confidential/docs/COMPLIANCE.md	Compliance documentation is clarified to specify that check_not_frozen targets only the sender and recipient accounts, removing any prior implication of spender account involvement.
DESIGN documentation formatting standardization packages/tokens/src/confidential/docs/DESIGN.md	Address field identifier addr_f is escaped to addr\_f throughout key-derivation formulas, circuit constraints (Register, Withdraw, Transfer, SetSpender, RevokeSpender), and public-input tables for consistent markdown rendering.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~4 minutes

Suggested reviewers

• ozgunozerk
• bidzyyys

🐰 Dependencies dance and docs align,
UltraHonk's new home shines bright and fine,
Addresses escape their markdown plight,
Compliance flows clear—everything right! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	No pull request description was provided by the author, but the template requires description and checklist items for new features and documentation changes.	Add a pull request description explaining the changes, reference any related issues, and complete the PR checklist items (Tests and Documentation).

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Bump soroban_sdk and docs fixes' accurately describes the main changes: a dependency version bump and documentation updates across multiple files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-sdk-and-docs

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.62%. Comparing base (1fd1b5f) to head (fb7b84c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #749   +/-   ##
=======================================
  Coverage   96.62%   96.62%           
=======================================
  Files          71       71           
  Lines        7468     7468           
=======================================
  Hits         7216     7216           
  Misses        252      252           

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