docs(order-compute): tokens, catalog-first attestation check, and a fast path

[GigaHierz]

Why

Three findings in #12 and one in #11, all confirmed against the live gateway and the published @celo/buy@0.5.0 tarball today:

• GET /gcloud/catalog returns tokens: ["USDC","USDT","USAT"] and the 402 carries three accepts, but @celo/buy-core@0.5.0 has addresses only for USDC and USDT. The skill said "USDC or USDT" in every price cell and never stated what --token accepts, so an agent could neither know the valid values nor explain the third entry.
• The catalog already exposes attestationRequired per machine type. The skill told agents to discover it by POSTing each type and reasoning from an absent extra.selfRequirements, which costs a request per type.
• insufficient_balance names only the selected token (USDC by default), so a USDT-only wallet is told to go fund USDC when --token USDT would settle immediately.
• setup cannot import a key, so anyone who declared an agent wallet elsewhere ends up paying from a second, undeclared address.

Beyond the issues, the skill had no single place saying how few calls a purchase needs. Agents were probing per type and re-quoting, which is most of the latency between "rent me a VM" and a result.

What

skills/order-compute/SKILL.md only.

• New Fast path section at the top: catalog → quote → pay → poll, and "do not add calls between them".
• Price column is plain USD. New Tokens paragraph: USDC and USDT are the only values for --token / token; the gateway's third entry (Tether America USD) is accepted upstream but not signable with the pinned release, so do not offer or pass it.
• Attestation section reads attestationRequired from the catalog; the 402 stays as the confirmation for the exact body.
• insufficient_balance row: check balances, retry with the other accepted token before asking the user to fund.
• Wallet section: buy pays only from a wallet it generated; declare that address wherever an agent wallet was already declared; funding it is an ordinary ERC-20 transfer outside the CLI.

The third token is deliberately named by its display name rather than its symbol so that PR #10's token check (which fails on any mention of a symbol the pinned CLI cannot sign for) passes; once a release ships the address, that same check will flag the skill for not documenting it.

Verification

• curl https://usebuy.ai/gcloud/catalog — prices and attestationRequired match the table.
• PR ci: check the skill against the deployed gateway, not a branch #10's scripts/check-against-gateway.mjs run against this branch:

  catalog: https://usebuy.ai/gcloud/catalog -> 200, 6 machine types
  tokens: catalog USDC/USDT/USAT, @celo/buy-core@0.5.0 signs USDC/USDT
  the published skill matches the deployed gateway at @celo/buy@0.5.0
  

• @celo/buy-core@0.5.0 dist/chains.js TOKENS.celo has USDC and USDT only.

Closes #12 (items 1–3; item 4 is a file-feedback fix in its own PR). Refs #11 (the CLI-side fix is tracked upstream).

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