fix: unresolved import in sdk

[jonasXchen]

Problem

SDK triggers error "unresolved import" when building.

Solution

Set feature flag "sdk" for optional import

Summary by CodeRabbit

• New Features
  • Added serialization library to the public API when the SDK feature is disabled.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

A conditional public re-export of the rkyv crate is added to the library's public API. This export is only available when the "sdk" feature flag is not enabled. No logic or control flow changes are introduced.

Changes

Cohort / File(s)	Change Summary
Feature-gated public re-export src/lib.rs	Added conditional public re-export: pub use rkyv; guarded by #[cfg(not(feature = "sdk"))] to expose rkyv when the "sdk" feature is disabled

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: fixing an unresolved import issue in the SDK by conditionally re-exporting rkyv based on a feature flag.
Description check	✅ Passed	The description covers the essential problem and solution but is minimal and lacks detail compared to the template structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ 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 jonasXchen/rkyv-import

---

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5d14415 and 59f72ef.

📒 Files selected for processing (1)

• src/lib.rs (1 hunks)

🧰 Additional context used

🧠 Learnings (1)

📚 Learning: 2025-10-15T11:45:25.802Z

Learnt from: snawaz
Repo: magicblock-labs/delegation-program PR: 107
File: src/entrypoint.rs:141-144
Timestamp: 2025-10-15T11:45:25.802Z
Learning: In the delegation-program codebase, prefer using `log!` (from pinocchio_log) over `msg!` for error and panic scenarios in the entrypoint code, as per maintainer preference.

Applied to files:

• src/lib.rs

🔇 Additional comments (1)

src/lib.rs (1)

46-47: ```shell
#!/bin/bash

Description: Verify feature flag logic - check if diff module is conditionally compiled

echo "=== Checking if diff module is feature-gated ==="
rg -n 'cfg.*feature.*sdk' src/lib.rs

echo -e "\n=== Checking module declarations in lib.rs ==="
rg -n -A 1 'mod diff' src/lib.rs

echo -e "\n=== Checking state module contents ==="
ls -la src/state/

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