feat(discovery): add OpenCode Go protocol adapters

[seonghobae]

Summary

• discover the OpenCode Go catalog independently from Zen with the existing OPENCODE_ZEN_API_KEY
• keep Go provider-account and refresh failure identity separate from Zen
• route the officially documented Chat Completions models and reuse the existing Chat/Responses conversion seam
• retain Responses-native, Messages-native, and unknown Go models as evidence-only because the live catalog does not expose protocol metadata and this repository has no reusable Anthropic Messages adapter

Live catalog evidence

A credential-free request to https://opencode.ai/zen/go/v1/models returned 34 rows. Every row had only id, object, created, and owned_by; no endpoint or protocol field was present.

OpenCode's official Go documentation supplies the endpoint grouping used for the minimal Chat Completions allowlist:
https://opencode.ai/docs/go

Tests

• uv run pytest -q tests/test_opencode_go.py tests/test_model_discovery.py tests/test_provider_catalog_bootstrap.py tests/test_provider_catalog_store.py tests/test_local_mlx.py tests/test_chat_passthrough_capability_isolation.py (230 passed)
• uvx ruff check --select F --ignore F821 contextual_orchestrator/orchestrator.py contextual_orchestrator/model_discovery.py tests/test_opencode_go.py
• git diff --check

The final PR diff is 3 files, 95 insertions, and 2 deletions. The prior 298-line adapter was removed. No merge requested or performed.

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Reviewing files that changed from the base of the PR and between 17095da and 4254441.

📒 Files selected for processing (3)

• contextual_orchestrator/model_discovery.py
• contextual_orchestrator/orchestrator.py
• tests/test_opencode_go.py

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