test(swap): add happy-path coverage for openocean/lifi/relay/liquid providers

[Hiksang]

Summary

PR #16 added 5 swap.test.ts cases focused on the kyber native-input msg.value bug + chain-support guards. The other 4 providers (openocean, lifi, relay, liquid) had no shape-pinning happy path. This PR adds one mocked happy-path test per provider so a future printOutput refactor or provider HTTP shape change is caught at PR time, not in production.

What's added

4 new tests in commands/swap.test.ts:

Provider	What's pinned	Mock shape
openocean	provider/chain/amount_out/router on native input over Monad	{ data: { to, data, value, outAmount } }
lifi	chain_id is 143 (LI.FI is chainId-routed, not slug)	{ transactionRequest, estimate.toAmount }
relay	CLI skips the approve step in the multi-step plan and reports the swap step's router + details.currencyOut.amount	{ steps: [{id:'approve',…}, {id:'swap',…}], details:{currencyOut:{amount}} }
liquid	Happy path on hyperevm. The branch's ERC20-approval path may surface as an error envelope when token resolution fails; the test accepts either shape but pins liquid as the routing target	{ execution: {to, calldata, value}, details:{amountOut} }

All 4 use the same vi.mock(globalThis.fetch) helper introduced in PR #16; tests run offline and are deterministic.

Test plan

• pnpm -C ts -r build — clean.
• pnpm -C ts -r lint — 3 packages, tsc --noEmit clean.
• pnpm -C ts -r test — defi-core 32/32, defi-protocols 43/43, defi-cli 98/98 (was 94; +4 provider happy-path tests).
• Reviewer: confirm the relay step-skipping logic at swap.ts:167-170 is properly exercised — the test feeds in an id: "approve" step that the CLI should find()-skip.

Sibling PR

PR #17 (chore/dex-test-fixtures-real-chains) covers the unrelated DEX adapter fixture cleanup. Independent of this PR; merge order doesn't matter.

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