Feat/issue 197 sponsored reserve#248
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…lar-split#195) Introduces Sep41Adapter, a thin normalisation layer over Soroban token contracts that may or may not implement the full SEP-41 spec. Lazy capability probing (same FunctionNotFound pattern as featureDetection) gates allowance/approve calls and returns null with a console.warn for unsupported methods. Exports wired into src/index.ts. Unit tests cover full SEP-41, transfer-only, and missing-method token shapes. Closes Stellar-split#195 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Stellar-split#198) Introduces HorizonFallbackReader (src/horizonFallback.ts) that wraps Horizon.Server and normalises getAccount / getAccountBalances responses into SDK-wide NormalizedAccount and NormalizedBalance shapes. StellarSplitClientConfig gains an optional horizonUrl field. When set, the client creates a HorizonFallbackReader and wires the two new public methods (getAccount, getAccountBalances) through a FallbackChain so that a failing Soroban RPC getAccount call automatically retries against Horizon. Write paths are unaffected and continue to require a live Soroban RPC endpoint. NormalizedAccount and NormalizedBalance are exported from src/index.ts. 11 unit/integration tests cover: normalised shapes, RPC-healthy path, RPC-failure → Horizon fallback, missing-horizonUrl error paths. Closes Stellar-split#198 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Stellar-split#197) Introduces buildSponsoredOnboarding (src/sponsorship.ts) which wraps caller-provided operations between beginSponsoringFutureReserves and endSponsoringFutureReserves so that a brand-new payer account can fund an invoice without first acquiring XLM. Operation ordering enforced: begin (source=sponsor) → inner ops → end (source=newAccount). Both accounts must co-sign the returned unsigned transaction before submission. When config.horizonUrl is set the function fetches the sponsor's live XLM balance via Horizon.Server.loadAccount and verifies that the available balance covers the sponsor's own minimum (1 XLM) plus one base reserve (0.5 XLM) per wrapped operation. Two typed errors are exported: MissingSponsorAccountError (config.sponsorAccount absent) and InsufficientReserveError (balance too low, exposing availableStroops and requiredStroops). StellarSplitClientConfig gains sponsorAccount?: string. buildSponsoredOnboarding, MissingSponsorAccountError, and InsufficientReserveError are exported from src/index.ts. 11 unit tests cover op ordering, missing config, insufficient balance, balance check skip, and reserve math scaling with op count. Closes Stellar-split#197 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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closes #197