Implement CompositeToolRefs resolution in VirtualMCPServer converter

[amirejaz]

Summary

Implements resolution of CompositeToolRefs in the VirtualMCPServer converter. The converter now fetches referenced VirtualMCPCompositeToolDefinition resources from Kubernetes, converts them to CompositeToolConfig entries, and merges them with inline CompositeTools.

Fixes #2774

Changes

• Converter: Added k8sClient field to Converter struct to enable fetching Kubernetes resources
• NewConverter: Updated to accept k8sClient as required parameter (non-variadic)
• convertAllCompositeTools: New method that orchestrates conversion of both inline and referenced tools
• convertReferencedCompositeTools: Fetches and converts referenced VirtualMCPCompositeToolDefinition resources
• convertCompositeToolDefinition: Converts VirtualMCPCompositeToolDefinition CRD to CompositeToolConfig
• validateCompositeToolNames: Validates for duplicate tool names across all composite tools
• Controller: Updated to pass r.Client to converter for resource fetching

Testing

• ✅ Unit tests for converter logic with fake Kubernetes clients
• ✅ Integration tests for controller reconciliation flow
• ✅ End-to-end tests verifying ConfigMap generation with referenced tools
• ✅ Error handling tests for missing resources and duplicate names
• ✅ Manual testing on Kind cluster with ko deployment

Verification

Tested manually on Kind cluster:

• Referenced tools are fetched from Kubernetes
• Inline and referenced tools are merged correctly
• Multiple referenced tools work as expected
• Error handling works for missing resources
• ConfigMap contains all composite tools (inline + referenced)

Large PR Justification

This PR implements CompositeToolRefs support for VirtualMCPServer, which requires coordinated changes across API definitions, controller validation, converter logic, watch mechanisms, and integration tests. The changes follow the established GroupRef validation pattern and must be atomic to maintain consistency across all layers.

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.39%. Comparing base (7906ead) to head (5e87b4a).
⚠️ Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
...perator/controllers/virtualmcpserver_controller.go	27.65%	30 Missing and 4 partials ⚠️
cmd/thv-operator/pkg/vmcpconfig/converter.go	89.83%	9 Missing and 3 partials ⚠️
...v-operator/pkg/virtualmcpserverstatus/collector.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2885      +/-   ##
==========================================
- Coverage   56.41%   56.39%   -0.02%     
==========================================
  Files         322      322              
  Lines       31638    31758     +120     
==========================================
+ Hits        17848    17911      +63     
- Misses      12252    12311      +59     
+ Partials     1538     1536       -2     

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[Copilot]

Pull request overview

This PR implements resolution of CompositeToolRefs in the VirtualMCPServer converter, enabling users to reference shared VirtualMCPCompositeToolDefinition resources instead of only defining composite tools inline. The implementation adds Kubernetes resource fetching capabilities to the converter and properly merges inline and referenced tools while validating for duplicate names.

Key changes:

• Added Kubernetes client to the Converter struct to enable fetching referenced resources
• Implemented orchestration logic to merge inline CompositeTools with referenced CompositeToolRefs
• Added comprehensive validation to detect duplicate tool names across inline and referenced tools

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
cmd/thv-operator/pkg/vmcpconfig/converter.go	Added k8sClient field, new methods for fetching/converting referenced tools, and validation logic
cmd/thv-operator/pkg/vmcpconfig/converter_test.go	Added comprehensive unit tests covering successful resolution, merging, error cases, and nil client handling
cmd/thv-operator/controllers/virtualmcpserver_vmcpconfig.go	Updated converter instantiation to pass r.Client for resource fetching
cmd/thv-operator/controllers/virtualmcpserver_vmcpconfig_test.go	Added end-to-end integration tests verifying ConfigMap generation with referenced tools

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[amirejaz]

will address copilot feedback and fix ci

[jhrozek]

good work, some nits inline

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

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[github-actions]

Large PR Detected

This PR exceeds 1000 lines of changes and requires justification before it can be reviewed.

How to unblock this PR:

Add a section to your PR description with the following format:

## Large PR Justification

[Explain why this PR must be large, such as:]
- Generated code that cannot be split
- Large refactoring that must be atomic
- Multiple related changes that would break if separated
- Migration or data transformation

Alternative:

Consider splitting this PR into smaller, focused changes (< 1000 lines each) for easier review and reduced risk.

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This review will be automatically dismissed once you add the justification section.

[jhrozek]

@amirejaz there is a conflict now

Large PR justification has been provided. Thank you!

[github-actions]

✅ Large PR justification has been provided. The size review has been dismissed and this PR can now proceed with normal review.

[jhrozek]

Two comments for later, but overall LGTM