test(sdk): cover keeper-tx status-code boundary and case-insensitivity

[collinsezedike]

Summary

• Closes [Test] keeper-tx.ts has no test file #657
• packages/stellar-sdk-helpers/src/keeper-tx.test.ts already existed on main (a separate coverage PR landed it), but it was missing a few edge cases that matter for keeper retry correctness
• Ports the missing assertions from test(sdk): cover keeper-tx error classification helpers #679 (closed as superseded, since it added a new file at the same path and conflicted): the status-code word-boundary guard, all five retryable status codes tested individually, case-insensitive keyword matching, and the distinction between a confirmed on-chain failure and a still-unknown timeout outcome
• No production code changed

Test plan

• pnpm --filter @meridian/stellar-sdk-helpers test -- keeper-tx.test.ts — 15 tests passing
• prettier --check on the modified file — clean

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Project	Deployment	Actions	Updated
meridian	Error		Sep 1, 2026 9:15pm UTC