feat: add safe retry policy for transaction submissions#200
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- Add SubmissionOutcome discriminated union (success, retryable_failure, non_retryable_failure, unknown_status) to src/types/index.ts - Add RetryPolicy and RetryPolicyExhaustedResult interfaces - Add classifySubmissionOutcome(), isSafeToRetry(), requiresStatusCheck() to src/errors/index.ts - Add withRetryPolicy() in src/network/retry-policy.ts — applies exponential backoff only to retryable outcomes; delegates unknown_status to submitTransactionIdempotently (status polling) instead of blind resubmission, preventing duplicate payments - Export all new symbols from src/index.ts - Add 34 unit tests covering all outcome variants, duplicate-risk guard, exhaustion handling, and onAttempt callback - Add docs/retry-policy.md with outcome table, decision tree, API reference, and no-blind-resubmission guarantee - Update README.md with link to retry-policy doc
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closes #172