Add support for AVM pattern modules in Azure Terraform tools

[liuwuliuyun]

What does this PR do?

Adds support for AVM pattern modules (avm-ptn-*) to the Azure Terraform avm tools. Previously these tools only surfaced resource modules (avm-res-*) from TerraformResourceModules.csv. The service now also fetches TerraformPatternModules.csv (identical schema) and merges both into one collection.

• azureterraform avm list returns both resource and pattern modules, each tagged with a new moduleType field ("resource" or "pattern").
• azureterraform avm versions and azureterraform avm get work unchanged for pattern modules, since they already resolve a module by name from the merged collection and derive GitHub URLs from each module's RepoUrl.

No new commands or options — pattern modules are discoverable through the existing tools.

Implementation notes for reviewers:

• Both CSVs are fetched in parallel (Task.WhenAll) and cached together under the existing 24h cache.
• ParseModuleCsv gained a moduleType parameter to stamp each module; the pattern CSV has a leading BOM on its header, which is now stripped.
• Verified end-to-end against live data: avm list returns 141 modules (112 resource + 29 pattern, correctly tagged); versions/get confirmed working for the avm-ptn-aca-lza-hosting-environment pattern module; resource modules unaffected (regression checked).

Documentation: Azure Verified Modules (Terraform) · Pattern module index

GitHub issue number?

N/A — no linked issue.

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Created a changelog entry if the change falls among the following: new feature, bug fix, UI/UX update, breaking change, or updated dependencies. Follow the changelog entry guide
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes running the script ./eng/scripts/Process-PackageReadMe.ps1. See Package README
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For renamed tools, follow the Tool Rename Checklist and tag the PR with the breaking-change label
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • Updated test prompts in servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull request overview

Adds AVM pattern module (avm-ptn-*) discovery to the Azure Terraform AVM tools by fetching and merging the pattern-module CSV alongside the existing resource-module CSV, and exposing the module kind via a new moduleType field.

Changes:

• Fetch TerraformResourceModules.csv and TerraformPatternModules.csv in parallel, merge, and cache the combined module collection.
• Add ModuleType to AvmModule and stamp parsed modules as "resource" or "pattern" (including BOM stripping for the pattern CSV header).
• Update tests, command descriptions, docs/examples, spelling dictionary, and add a changelog entry.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.AzureTerraform/src/Services/AvmDocsService.cs	Fetch pattern-module CSV in parallel with resource-module CSV, merge results, stamp moduleType, strip BOM in header parsing.
tools/Azure.Mcp.Tools.AzureTerraform/src/Models/AvmModule.cs	Add ModuleType field surfaced in responses.
tools/Azure.Mcp.Tools.AzureTerraform/tests/Azure.Mcp.Tools.AzureTerraform.Tests/AvmDocsServiceParsingTests.cs	Add coverage for module typing and BOM header stripping.
tools/Azure.Mcp.Tools.AzureTerraform/tests/Azure.Mcp.Tools.AzureTerraform.Tests/AvmModuleListCommandTests.cs	Validate response includes both resource and pattern module types.
tools/Azure.Mcp.Tools.AzureTerraform/src/Commands/AvmModuleListCommand.cs	Update tool description to mention pattern modules and moduleType.
tools/Azure.Mcp.Tools.AzureTerraform/src/Commands/AvmVersionListCommand.cs	Update tool description to mention pattern modules.
tools/Azure.Mcp.Tools.AzureTerraform/src/Commands/AvmDocumentationGetCommand.cs	Update tool description to mention pattern modules.
tools/Azure.Mcp.Tools.AzureTerraform/src/AzureTerraformSetup.cs	Update AVM group description to mention pattern modules.
servers/Azure.Mcp.Server/README.md	Add example prompt for pattern-module docs.
servers/Azure.Mcp.Server/docs/e2eTestPrompts.md	Add e2e prompts covering pattern module list/versions/get.
servers/Azure.Mcp.Server/docs/azmcp-commands.md	Clarify avm list returns both resource and pattern modules.
servers/Azure.Mcp.Server/changelog-entries/avm-pattern-modules.yaml	Changelog entry for new pattern-module support.
.vscode/cspell.json	Add words used by new tests/implementation (aiml, feff).