Add missing subpath exports, delete dead horizon.ts, and add the RPC/hook regression tests (#100, #104, #107, #110)

[Jaydbrown]

Four SDK issues — a packaging bug, two type-check bugs (already fixed on main by #148, so this adds the regression tests their acceptance criteria require), and a dead-code removal.

#100 — missing ./escrow subpath export (packaging bug)

The README Quick Start does import { createEscrow } from '@trustflow/sdk/escrow' (and /wallet, /utils), but package.json's exports only declared . and ./react, so those imports fail with ERR_PACKAGE_PATH_NOT_EXPORTED for anyone installing the published package.

• tsup.config.ts builds src/escrow/index.ts, src/wallet/index.ts, src/utils/index.ts as their own targets → dist/escrow/index.* etc.
• package.json exports gains ./escrow, ./wallet, ./utils with matching types / import / require.
• tests/exports-resolution.test.ts — a CI step (per the AC) that pulls every @trustflow/sdk/* specifier out of README.md and asserts each resolves against the exports map, every condition points at a ./dist/… path, and each non-root subpath is a tsup entry.

#104 — SorobanRpc import (already fixed on main, test added)

src/contract/{invoke,read,simulate}.ts already import rpc (not the nonexistent SorobanRpc) and use new rpc.Server(...). What was missing is the AC's "regression test would fail if this import broke again": tests/contract-rpc-smoke.test.ts constructs rpc.Server through src/contract/index.ts's dependency graph and asserts the old SorobanRpc name stays gone.

#107 — useEscrow import of createEscrow/releaseEscrow

src/escrow/index.ts now re-exports both free functions (from create.ts / release.ts), and both take client: TrustFlowClient and go through invokeContract — so useEscrow type-checks against the real API, not a phantom one. This PR:

• exports useEscrow from src/hooks/index.ts (it still ships only from the @trustflow/sdk/react subpath, per Export React hooks from package entrypoint and declare react as a peerDependency #81) and replaces the now-inaccurate "these imports don't exist" comment;
• adds tests/use-escrow.test.ts — React stubbed for Jest node, covering create/release success (resolves, stores, clears error) and failure (surfaces message, rethrows).

#110 — dead duplicate submitTransaction

src/stellar/horizon.ts exported a second submitTransaction(client, xdr) that nothing imports (not on the src/stellar barrel, no call sites — MultiSigEscrowClient.submitWhenReady uses the (xdr, horizonUrl) version in src/stellar/transaction.ts). Deleted. tests/stellar-single-submit.test.ts fails if a second implementation reappears or horizon.ts comes back.

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Not built or run in this environment. src changes are limited to tsup.config.ts, package.json, src/hooks/index.ts, and deleting src/stellar/horizon.ts; the rest are new test files and docs. CHANGELOG [Unreleased] updated (no version bump, so tests/version.test.ts is unaffected).

Closes #100, closes #104, closes #107, closes #110

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