feat(helm): allow custom annotations on the default ModelConfig

[marians]

What

Adds an optional per-provider annotations map that is rendered onto the metadata of the Helm-generated default ModelConfig (the one derived from providers.default).

Why

Today helm/kagent/templates/modelconfig.yaml emits only name/namespace/labels — there is no supported way to attach annotations to the default ModelConfig via values. Downstream distributions and tooling that key off resource annotations (e.g. a UI reading a display-name annotation) currently have to either post-render the chart-owned object or define a separate, self-managed ModelConfig (leaving the chart's unconditional default ModelConfig created but unused). See #2200.

How

providers:
  anthropic:
    provider: Anthropic
    model: claude-haiku-4-5
    annotations:
      example.com/display-name: "Claude Haiku 4.5"

The map is generic (no vendor-specific keys) and omitted entirely when unset.

Testing

helm template verified in two cases: with annotations set the block renders under metadata.annotations; without it the output is byte-identical to before (backward-compatible).

Closes #2200

[Copilot]

Pull request overview

Adds support for specifying arbitrary Kubernetes annotations on the Helm-generated default ModelConfig (the one derived from providers[.Values.providers.default]), enabling downstream tooling/distributions to attach metadata without post-rendering or managing a separate ModelConfig.

Changes:

• Document a new optional per-provider annotations map in values.yaml.
• Render providers.<default>.annotations under metadata.annotations for the generated default ModelConfig, omitting the block when unset.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
helm/kagent/values.yaml	Documents the new optional per-provider annotations values knob for the default ModelConfig.
helm/kagent/templates/modelconfig.yaml	Conditionally renders $model.annotations into metadata.annotations on the generated default ModelConfig.

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[EItanya]

Can we add this key under providers so that we can have a default annotations: {} key to show the API?