fix(providers): route Muse Spark 1.3 through Responses API

[shermzy]

Summary

• Register opencode-go/muse-spark-1.3-contributor and its minimal, low, medium, high, and xhigh variants with the Responses wire format.
• Teach the OpenCode executor about the 1.3 effort-tier aliases.
• Add focused registry, executor URL, effort parsing, and combo coverage.

Fixes #12674

Validation

• npm run typecheck:core — passed.
• Targeted ESLint — passed.
• Focused issue and neighboring tests — 66 passed.
• Controlled full Vitest run — 51 files / 465 tests passed.
• Commit hooks — passed (Prettier, ESLint, docs sync, budget, tracked-artifact checks).
• npm run build was started but stopped after the shared host reached approximately 9.3 GB build memory with about 0.5 GB free; no compiler diagnostic had appeared.
• npm run test:unit was started but stopped during the repository's large process-isolated suite; the issue-specific tests passed before the stop.

Release note

The target branch currently has open base-red issue #12732, so merge should wait for the release-drain failures to clear.

[diegosouzapw]

Thanks for this fix — the core approach (registry targetFormat + EFFORT_TIERS) is correct and your test that actually calls OpencodeExecutor.execute() with a mocked fetch to assert the real dispatch URL is genuinely stronger than the other PRs on this issue.

The issue's own follow-up (from the maintainer) asks for the fix to also cover the opencode-zen registry and the base opencode registry, not just opencode-go — PR #13111 already covers all three. To avoid duplicate registry entries we're planning to merge #13111 and port your dispatch-URL test into it with credit to you. Let us know if you'd rather extend this PR to cover the other two registries instead — happy to go either way.

Triage note: this is the review recommendation — the close itself happens only after the maintainer's per-PR sign-off (and, where a superseding PR is named, after it has landed). Nothing is being closed by this comment.

[diegosouzapw]

Thanks for catching this! Muse Spark 1.3 routing through the Responses API landed via #13471, which covers OpenCode Zen, OpenCode and OpenCode Go plus the effort aliases and credits the parallel reports. The registry entries, getTokenLimit and resolveOpencodeTargetFormat are all covered by its tests, so this PR is now redundant. Closing as covered by #13471.