SDK: getClaim (singular) returning the full claim record

[Psalmuel01]

Summary

getClaims returns all claims; hasClaim returns a bool. There's no single-claim detail fetch. Add getClaim(wallet, type) returning { valid, verifiedAt, expiry } (or null) so UIs can show expiry/verifiedAt without pulling every type.

What to build

• export async function getClaim(wallet, claimType, opts?): Promise<Claim | null>
• Reuses readIsVerified; respects trustedIssuers
• Added to the StellarCred namespace + README

Acceptance criteria

• getClaim returns the record or null
• Respects trustedIssuers
• Exported from namespace + default export
• pnpm tsc --noEmit passes---

✅ Merge requirements (read before starting)

Before this PR can be merged, all of the following must hold:

• All CI checks pass (contracts, frontend, circuits as applicable)
• Every Greptile review comment is addressed — no unresolved review threads
• Greptile confidence score is 4/5 or higher

Greptile performs the detailed code review on each PR. Please resolve its feedback fully before requesting a human merge — PRs below 4/5 or with open Greptile threads will not be merged.

[praise-idise]

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Hi, please I would love to work on this issue.

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