Add OpenRouter free model support to Strix and OpenCode review

[seonghobae]

Why

OpenCode review and Strix model gating only supported GitHub Models, direct OpenAI, and approved Vertex inputs. We need explicit support for OpenRouter's free endpoint (openrouter/free) so CI review/scanning can route through it when configured.

What changed

• Added OpenRouter provider wiring to OpenCode review workflow config generation:
  • enabled provider list now includes openrouter
  • provider config uses https://openrouter.ai/api/v1 with OPENROUTER_API_KEY
  • added openrouter/free model and inserted openrouter/openrouter/free into OPENCODE_MODEL_CANDIDATES
• Updated OpenCode model-pool runner to skip OpenRouter candidates when OPENROUTER_API_KEY is absent, matching existing provider-qualified skip behavior.
• Extended Strix workflow gate/model handling to accept openrouter/free (and openrouter/openrouter/free), route it through provider_mode=openrouter, require OPENROUTER_API_KEY, and prepare OpenRouter API base input files.
• Kept fallback behavior aligned by allowing the existing GitHub Models fallback credential path for OpenRouter runs.
• Updated Strix/OpenCode contract strings and model list assertions in the workflow-adjacent test/contract files to match the new allowed model/provider surface.

Notes for reviewers

• The unsupported-model error contract text was intentionally expanded to include OpenRouter so downstream failure-diagnosis checks and static contract assertions stay in sync.
• Runtime behavior remains fail-closed for missing provider credentials.

[Copilot]

Pull request overview

This PR extends the org’s CI review/scanning infrastructure to explicitly support OpenRouter’s free endpoint (openrouter/free) across both OpenCode review model selection and Strix model gating, updating workflow wiring and contract/self-test assertions so the new provider/model surface is treated as first-class.

Changes:

• Added openrouter as an enabled provider in the OpenCode review workflow configuration and declared the openrouter/free model with OPENROUTER_API_KEY.
• Updated the OpenCode model-pool runner to skip OpenRouter candidates when OPENROUTER_API_KEY is not configured (mirroring existing provider-qualified skip behavior).
• Extended Strix workflow gating to accept openrouter/free / openrouter/openrouter/free, require OPENROUTER_API_KEY, and write an OpenRouter API base input file; updated related contract/self-test strings.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/test_opencode_agent_contract.py	Updates OpenCode workflow contract expectations to include the OpenRouter provider and candidate model.
scripts/ci/test_strix_quick_gate.sh	Updates Strix/OpenCode workflow self-test assertions to include OpenRouter wording and model candidates.
scripts/ci/run_opencode_review_model_pool.sh	Adds OpenRouter candidate detection and skip-on-missing-key behavior.
scripts/ci/emit_opencode_failed_check_fallback_findings.sh	Updates known-missing-string findings to match expanded Strix unsupported-model contract text.
.github/workflows/strix.yml	Adds OpenRouter model gating, key requirements, API base preparation, and provider-mode routing for Strix.
.github/workflows/opencode-review.yml	Enables the OpenRouter provider and adds openrouter/free to the OpenCode model candidate pool and secrets environment.

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.