ci(review): route reviews to GPT-5.6 tiers

[luckyPipewrench]

Route ordinary PR reviews to GPT-5.6 Luna with low reasoning and deep reviews to GPT-5.6 Terra with medium reasoning. Centralize default selection in the runner, accept optional repository-variable overrides, harden trusted workflow invocation, and add regression coverage for routing and API-response failures.

Summary by CodeRabbit

• Improvements

  • PR reviews now support configurable fast and deep review models, with reliable defaults when custom settings are unavailable.
  • Review requests can use the configured AI service endpoint and authentication settings.
  • Posted review details more accurately reflect the model and reasoning mode used.

• Security

  • Added safeguards to ensure automated reviews run only under trusted conditions.

• Tests

  • Added coverage for model selection, configuration overrides, fallback behavior, reasoning settings, and security checks.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c2a7d85a-fbd7-4323-9c4a-361c977f053f

📥 Commits

Reviewing files that changed from the base of the PR and between e98ea1e and c3707ee.

📒 Files selected for processing (3)

• .github/workflows/pr-review.yaml
• scripts/pr-review.py
• tests/test_pr_review_routing.py

📝 Walkthrough

Walkthrough

The PR makes fast and deep review models configurable through repository variables. Python defaults apply when variables are empty or unset. LiteLLM credentials are passed to the workflow, and routing and security tests were added.

Changes

PR review model routing

Layer / File(s)	Summary
Model defaults and routing scripts/pr-review.py	The script uses gpt-5.6-luna for fast modes and gpt-5.6-terra for deep mode. model_for_mode() applies non-empty environment overrides and Python fallbacks.
Review invocation and workflow integration .github/workflows/pr-review.yaml, scripts/pr-review.py	LLM calls and posted review metadata use shared routing. The workflow passes repository model variables and LiteLLM secrets.
Routing and workflow regression tests tests/test_pr_review_routing.py	Tests cover defaults, overrides, empty-variable fallbacks, reasoning-effort payloads, workflow delegation, and trusted-runner safeguards.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• luckyPipewrench/pipelock-verify-python#35: Introduced the PR review workflow and script extended by this change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes routing reviews to the GPT-5.6 model tiers, which is the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pr-review-model-routing

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@tests/test_pr_review_routing.py`:
- Around line 5-10: Reorder the imports in the test module’s top-level import
block to match Ruff’s I001 sorting rules, preserving all existing imports and
functionality.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e5abde73-ba0f-4c9d-9e92-4d85c917619b

📥 Commits

Reviewing files that changed from the base of the PR and between f70bca2 and e98ea1e.

📒 Files selected for processing (3)

• .github/workflows/pr-review.yaml
• scripts/pr-review.py
• tests/test_pr_review_routing.py