feat(helm): support documented config.model for default model

[RahilOp]

Fixes #2223

The provider docs show a config.model Helm value for setting the default model, but the chart never honored it. This PR wires it up by exporting the MODEL environment variable on the Holmes pod.

Changes:

• Added config: {} to helm/holmes/values.yaml with a usage comment.
• Added holmes.config and holmes.config.model helpers in _helpers.tpl that support both standalone config.model and subchart holmes.config.model value paths.
• In templates/holmes.yaml, emit a MODEL env var when config.model is set.
• Included the config value in the pod checksum annotation so changing the default model triggers a rollout.

No-op when config.model is unset. Users can continue using additionalEnvVars with MODEL if they prefer.

Verified:

• helm lint helm/holmes passes.
• helm template with config.model renders MODEL=gemini-flash.
• helm template without config.model omits the MODEL env var.
• helm template with subchart-style holmes.config.model also renders MODEL correctly.

Summary by CodeRabbit

• New Features

  • Added Helm configuration support for selecting an optional default model.
  • Supports configuration when Holmes is deployed independently or as a subchart.
  • Automatically applies the selected model to the deployment when configured.

• Bug Fixes

  • Deployment updates now correctly reflect changes to Holmes configuration.

[claude]

Claude Code Review

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 537894ea-f807-48e0-901d-5e31a6b08397

📥 Commits

Reviewing files that changed from the base of the PR and between 10b772b and 7ae9008.

📒 Files selected for processing (3)

• helm/holmes/templates/_helpers.tpl
• helm/holmes/templates/holmes.yaml
• helm/holmes/values.yaml

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Walkthrough

The Helm chart adds standalone and subchart configuration helpers, documents the optional config.model value, includes rendered configuration in the pod checksum, and exports the configured model through the MODEL environment variable.

Changes

Helm model configuration

Layer / File(s)	Summary
Configuration helpers and values helm/holmes/values.yaml, helm/holmes/templates/_helpers.tpl	The chart adds an optional config.model value. Helpers render standalone or subchart configuration and retrieve the configured model.
Deployment configuration wiring helm/holmes/templates/holmes.yaml	The pod checksum includes rendered configuration. The container sets MODEL when a model value is configured.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: roiglinik, aantn

🚥 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 Helm support for the documented config.model default model setting.
Linked Issues check	✅ Passed	The changes implement config.model support for standalone and subchart values, set MODEL, and trigger rollouts when configuration changes [#2223].
Out of Scope Changes check	✅ Passed	All described changes directly support the linked issue and PR objectives; no unrelated code changes are identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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