feat(lambdai): implement provider simulator

[ravisoundar]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a simulation provider for Lambda (lambdai-sim) that enables testing Lambda topology generation without requiring actual Lambda API access.

• Implements simClient that reads topology from model YAML files instead of calling Lambda API
• Supports pagination through InstanceList with proper bounds checking
• Provides GetComputeInstances for engine support with appropriate error handling
• Follows established patterns from existing simulation providers (aws-sim, gcp-sim, oci-sim)
• Includes comprehensive test coverage for error cases, pagination, and both tree and block topology formats
• Integrates with the server test suite for end-to-end validation

Confidence Score: 5/5

• This PR is safe to merge - it adds a new simulation provider following well-established patterns with comprehensive test coverage.
• The implementation follows existing patterns from other simulation providers (aws-sim, gcp-sim), includes proper error handling, has comprehensive unit and integration tests, and makes no changes to production code paths. The code has better bounds checking than some existing providers.
• No files require special attention.

Important Files Changed

Filename	Overview
pkg/providers/lambdai/provider_sim.go	New simulation provider for Lambda with proper pagination, error handling, and consistent implementation following existing patterns from other cloud providers.
pkg/providers/lambdai/provider_sim_test.go	Comprehensive test suite covering error cases, pagination, and topology generation for both tree and block formats.
pkg/registry/registry.go	Registers the new Lambda simulation provider in the global provider registry.
pkg/server/http_server_test.go	Adds integration test case for Lambda simulation provider alongside existing AWS and GCP tests.

Sequence Diagram

sequenceDiagram
    participant Test as Test/Client
    participant LoaderSim as LoaderSim
    participant simProvider as simProvider
    participant simClient as simClient
    participant Model as models.Model

    Test->>LoaderSim: LoaderSim(ctx, cfg)
    LoaderSim->>Model: NewModelFromFile(modelPath)
    Model-->>LoaderSim: model
    LoaderSim->>simProvider: NewSim(clientFactory)
    simProvider-->>Test: provider

    Test->>simProvider: GenerateTopologyConfig(ctx, pageSize, instances)
    simProvider->>simClient: clientFactory(pageSize)
    simClient-->>simProvider: client

    loop For each ComputeInstances
        simProvider->>simClient: InstanceList(ctx, req)
        simClient->>Model: Access Nodes
        Model-->>simClient: Node data
        simClient-->>simProvider: InstanceListResponse
    end

    simProvider-->>Test: topology.Vertex

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[codecov]

Codecov Report

❌ Patch coverage is 82.81250% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.55%. Comparing base (7c9b841) to head (cabfa08).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/providers/lambdai/provider_sim.go	82.81%	9 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   64.34%   65.55%   +1.20%     
==========================================
  Files          80       81       +1     
  Lines        4384     4448      +64     
==========================================
+ Hits         2821     2916      +95     
+ Misses       1454     1419      -35     
- Partials      109      113       +4     

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