fix(vtex): surface real cause of "typo in url or port" errors

[viniciusventura29]

Summary

• When state.accountName arrived empty, the URL became https://.vtexcommercestable.com.br and Bun rejected it with the cryptic "Was there a typo in the url or port?" — across many tools.
• Adds a fail-fast assertValidCredentials check that throws a descriptive error naming the missing field, used in the generated-tool adapter and both custom tools (reorder-collection, update-product-specifications).
• Enriches SDK errors with credential-source context ([tool=… account=… accountSource=state|env|missing …]) and logs the resolved baseUrl + mesh-context shape on every tool call so the inconsistent state-propagation path can be diagnosed in production.

Test plan

• bun run check (vtex) — passes
• bun test (vtex) — 77 pass, 0 fail
• Reproduced locally: calling a tool without VTEX_ACCOUNT_NAME now returns the descriptive fail-fast error instead of the Bun "typo in url or port" message
• Verified through deco.host UI tunnel: when state is properly injected, [VTEX] tool=… mesh-context-shape: {hasToken:true, stateAccountNamePresent:true, …} is logged and the call succeeds

🤖 Generated with Claude Code

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Summary by cubic

Fail-fast validation for VTEX tools to prevent invalid base URLs and replace Bun’s “Was there a typo in the url or port?” with a clear error when accountName is missing. Adds source-aware error context and lightweight logging to make config issues easy to diagnose.

• Bug Fixes
  • Added assertValidCredentials in the tool adapter and custom tools to throw a clear error when accountName is missing (avoids https://.vtexcommercestable.com.br).
  • Updated resolveCredentials to pull from state or env and return per-field sources; warns when accountName is missing.
  • Enriched thrown errors with [tool=… account=… accountSource=…] context.
  • Logged baseUrl creation and mesh-context shape on each call to trace state propagation.

^{Written for commit 2052d4e. Summary will update on new commits.}