fix: set explicit model in CI workflows

[Gkrumbach07]

Summary

• Added model: claude-sonnet-4-5 to all ambient-action usages in CI workflows
• Affected workflows: pr-fixer.yml, pr-merge-review.yml, feedback-loop.yml
• Prevents 400 errors from the backend rejecting the invalid default model "sonnet"

Test plan

• PR fixer workflow creates sessions successfully
• Feedback loop workflow creates sessions successfully

🤖 Generated with Claude Code

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 1cd0d4d1-89e1-4104-a2a4-d66b42fa3cf0

📥 Commits

Reviewing files that changed from the base of the PR and between 3ee06fd and d9d671d.

📒 Files selected for processing (3)

• .github/workflows/feedback-loop.yml
• .github/workflows/pr-fixer.yml
• .github/workflows/pr-merge-review.yml

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Walkthrough

Added a model: claude-sonnet-4-5 parameter to ambient-action workflow steps across three GitHub workflow files: feedback-loop.yml, pr-fixer.yml (two invocations), and pr-merge-review.yml. No functional logic changes.

Changes

Cohort / File(s)	Summary
Workflow Model Configuration .github/workflows/feedback-loop.yml, .github/workflows/pr-fixer.yml, .github/workflows/pr-merge-review.yml	Added model: claude-sonnet-4-5 parameter to ambient-action inputs across three workflows. pr-fixer.yml receives the parameter in two separate invocations (single-PR and batch fix paths).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• fix: use valid model ID for default LLM settings #876: Sets the backend default model to claude-sonnet-4-5, complementing the workflow-level model specification in this PR.
• feat: add review queue and PR fixer GitHub Actions #874: Modifies the same workflow files (pr-fixer.yml and pr-merge-review.yml) that receive model parameter updates in this PR.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: set explicit model in CI workflows' directly and clearly summarizes the main change: adding an explicit model parameter to CI workflow configurations.
Description check	✅ Passed	The description is directly related to the changeset, detailing which model parameter was added, which workflows were affected, and the rationale for the change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/ci-workflow-model-names

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