Expand language capabilities and extraction coverage

[Widthdom]

Summary

• Expose language capability metadata and filters so search-only and missing-capability languages are visible in CLI/MCP languages output.
• Add JSON/YAML configuration symbols, build automation symbols/references, and GraphQL/HTML/Markdown reference coverage.
• Bump extractor contracts for the expanded languages so existing indexes reprocess unchanged files and pick up the new extraction output.
• Keep the branch current with latest origin/main; CI test fixture now uses a general JSON config file rather than package.json, which latest main classifies as dependency_manifest.

Issues

Fixes #3518
Fixes #3482
Fixes #3526
Fixes #3525

Changelog

• changelog.d/unreleased/3518.changed.md
• changelog.d/unreleased/3482.added.md
• changelog.d/unreleased/3526.added.md
• changelog.d/unreleased/3525.added.md

Validation

• dotnet restore CodeIndex.sln
• dotnet build CodeIndex.sln -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false --no-restore
• Targeted Release tests for the new/updated language, graph, contract, CLI, MCP, and snapshot coverage
• dotnet test CodeIndex.sln -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false --no-build --filter "FullyQualifiedName!~RunPublishedTrimmedCli_SerializesQueryJsonAndErrorJson"
• dotnet run --project tools/CodeIndex.Changelog -c Release --no-build -- check
• git diff --check origin/main..HEAD
• dotnet build src/CodeIndex/CodeIndex.csproj -c Debug -p:UseSharedCompilation=false -m:1 -nodeReuse:false
• dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll index . --verbose
• dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll status --check --json
• Conflict resolution validation after merging latest origin/main:
  • dotnet build CodeIndex.sln -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false
  • dotnet test tests/CodeIndex.Tests/CodeIndex.Tests.csproj -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false --no-build --filter "FullyQualifiedName~SymbolExtractorTests.Extract_CMake_DetectsTargetsOptionsAndPackages|FullyQualifiedName~SymbolExtractorTests.Extract_Justfile_DetectsRecipesAssignmentsAndImports|FullyQualifiedName~SymbolExtractorTests.Extract_MsBuild_DetectsTargetsPropertiesAndItems|FullyQualifiedName~SymbolExtractorTests.GetContractVersion_DockerfileSpecificKinds_UsesDedicatedVersion|FullyQualifiedName~SymbolExtractorTests.Extract_Dockerfile_DetectsStages"
  • dotnet run --project tools/CodeIndex.Changelog -c Release --no-build -- check
  • dotnet build src/CodeIndex/CodeIndex.csproj -c Debug -p:UseSharedCompilation=false -m:1 -nodeReuse:false
  • dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll index . --verbose
  • dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll status --check --json
• CI-failure fix and second origin/main merge validation:
  • dotnet test tests/CodeIndex.Tests/CodeIndex.Tests.csproj -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false --filter "FullyQualifiedName~IndexCommandRunnerTests.Run_FilesUpdate_ReindexesUnchangedJsonFileWhenExpandedLanguageExtractorVersionChanged"
  • dotnet build CodeIndex.sln -c Release -p:UseSharedCompilation=false -m:1 -nodeReuse:false
  • dotnet run --project tools/CodeIndex.Changelog -c Release --no-build -- check
  • dotnet build src/CodeIndex/CodeIndex.csproj -c Debug -p:UseSharedCompilation=false -m:1 -nodeReuse:false
  • dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll index . --verbose
  • dotnet ./src/CodeIndex/bin/Debug/net8.0/cdidx.dll status --check --json
• Codex adversarial review: initial review found stale extractor-contract invalidation; fixed, follow-up review reported No blocking/actionable issues found.

Note: the full unfiltered suite previously hit the local environment prerequisite for RunPublishedTrimmedCli_SerializesQueryJsonAndErrorJson because Microsoft.NETCore.App 10.0.8-servicing.26229.119 is not installed locally; the suite above excludes only that test.