chore: add SDK and discriminator to SDK feature

[GabrielePicco]

Summary by CodeRabbit

• Chores
  • Reorganized module structure: removed the instruction_builder module and made the discriminator module unconditionally available.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The PR modifies module declarations in src/lib.rs: the discriminator module is now included unconditionally (previously behind #[cfg(not(feature = "sdk"))]), and the pub mod instruction_builder is removed entirely.

Changes

Cohort / File(s)	Summary
Module exports and feature-gating adjustments src/lib.rs	Removed conditional compilation guard from discriminator module, making it always available; removed the entire pub mod instruction_builder declaration.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Verify whether removing instruction_builder is intentional and won't cause downstream breakage
• Confirm that unconditional inclusion of discriminator aligns with overall feature strategy
• Check for any documentation or changelog entries related to these public API changes

Possibly related PRs

• chore: add a feature to compile only types needed for the SDK #117: Directly modified the same modules; this PR moves discriminator to unconditional inclusion and removes the pub mod instruction_builder that was conditionally exposed in that PR.

Suggested reviewers

• snawaz
• taco-paco

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch picco/add-builder-disc-to-sdk

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📜 Recent review details

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 735640a and a7d7ff6.

📒 Files selected for processing (1)

• src/lib.rs (0 hunks)

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