feat(config): add gemini-4-argon model profile

[kweinmeister]

Summary

• Add [models.gemini-4-argon] with effort = "low" to bundled src/reach/reach.toml.
• Include gemini-4-argon in test_full_model_ids_have_profiles_in_reach_toml in tests/runtime/test_runtime.py.

[gemini-code-assist]

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[github-actions]

🤖 Antigravity AI Code Review

Model: Gemini 3.8 Flash | Commit: 762e7a0e3f748a4a9d87fcc3d34edfe35924cffd

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Here is the code review for the pull request:

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Pull Request Review: feat(config): add gemini-4-argon model profile

Overview

The PR introduces a new model profile gemini-4-argon to src/reach/reach.toml with effort = "low" and updates the test coverage in tests/runtime/test_runtime.py to ensure profile completeness.

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Findings & Feedback

💡 [SUGGESTION]: Align Model Naming Convention / Verify Model Identifier

• File: src/reach/reach.toml & tests/runtime/test_runtime.py
• Details:
  Standard Google Gemini API identifiers follow version and tier/codename naming conventions (e.g., gemini-X-tier or gemini-X.Y-tier). Ensure gemini-4-argon matches the canonical upstream provider ID or external API model name rather than an internal experimental codename unless this profile is intentionally pinned for a specialized preview/routing endpoint.
• Actionable Snippet (if alias/commenting is required):

# In src/reach/reach.toml
[models.gemini-4-argon]
effort = "low"

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💡 [SUGGESTION]: Maintain Logical Sorting in Model Test Manifest

• File: tests/runtime/test_runtime.py
• Details:
  In test_full_model_ids_have_profiles_in_reach_toml, models appear grouped by provider and ordered descending by release/version (claude-*, then gemini-* starting from newest). Placing gemini-4-argon at the top of the Gemini block preserves descending version hierarchy and alphabetical consistency.

Replacement Code:

<<<<
         "claude-sonnet-5",
         "claude-opus-5",
         "claude-haiku-4-5",
+        "gemini-4-argon",
         "gemini-3.8-flash",
====
         "claude-sonnet-5",
         "claude-opus-5",
         "claude-haiku-4-5",
         "gemini-4-argon",
         "gemini-3.8-flash",
>>>>

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Summary Checklist

• Security & Permissions: ✅ Pass. No secrets, untrusted deserialization, injection risks, or path traversals.
• Schema & Configuration: ✅ Pass. Valid TOML table syntax matching existing profile schema (effort = "low").
• Tests & Coverage: ✅ Pass. Manifest test test_full_model_ids_have_profiles_in_reach_toml was properly kept in sync with the config change.
• Verdict: APPROVE (non-blocking suggestions only).