fix(core): update contract error resolution signatures and add error …

[Bilalishaq7]

Closes #263

Overview

I'm all done with this implementation! This PR introduces the missing learn_more error documentation links to our diagnostic reports and resolves the compilation issues that cropped up from the recent context updates.

What's Done

• Error Links Added: Embedded the unified Stellar developer documentation URL directly into the DiagnosticReport struct generation logic inside report.rs.
• Module Resolution Fix: Corrected the module layout in crates/core/src/decode/mod.rs to map correctly to decode_context.rs instead of the legacy context.rs name.
• Type Signature Fix: Updated the operational filtering loop to construct a proper DecodeContext from the network configurations and pass its reference cleanly into contract_error::resolve.
• Code Cleanup: Removed an obsolete duplicate call to enrich_report.

Verification

• Ran local testing suite via cargo test and everything builds and passes cleanly without diagnostics errors.

Closes #263