Merge main into live

[gewarren]

Replaces #50760.

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docs/ai/quickstarts/build-mcp-server.md	Create a minimal MCP server using C# and publish to NuGet
docs/core/diagnostics/observability-applicationinsights.md	"Example: Use OpenTelemetry with Azure Monitor and Application Insights"
docs/core/diagnostics/observability-otlp-example.md	Example: Use OpenTelemetry with OTLP and the standalone Aspire Dashboard
docs/core/diagnostics/observability-prgrja-example.md	TYPE greetings_count counter
docs/core/extensions/httpclient-latency-extensions.md	docs/core/extensions/httpclient-latency-extensions
docs/core/extensions/logging-providers.md	Logging providers in .NET
docs/core/extensions/logging.md	Assigns the env var to the value
docs/core/introduction.md	Introduction to .NET
docs/core/sdk/file-based-apps.md	File-based apps
docs/csharp/language-reference/attributes/general.md	Miscellaneous attributes interpreted by the C# compiler
docs/csharp/language-reference/builtin-types/default-values.md	docs/csharp/language-reference/builtin-types/default-values
docs/csharp/language-reference/builtin-types/floating-point-numeric-types.md	Floating-point numeric types (C# reference)
docs/csharp/language-reference/builtin-types/reference-types.md	"Built-in reference types"
docs/csharp/language-reference/operators/index.md	C# operators and expressions
docs/csharp/language-reference/tokens/interpolated.md	String interpolation using $
docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix.md	docs/csharp/roslyn-sdk/tutorials/how-to-write-csharp-analyzer-code-fix
docs/csharp/tour-of-csharp/overview.md	A tour of the C# language
docs/csharp/tour-of-csharp/tutorials/index.md	Introduction to C#
docs/csharp/tour-of-csharp/tutorials/numbers-in-csharp.md	Tutorial: How to use integer and floating point numbers in C#
docs/samples-and-tutorials/index.md	.NET samples and tutorials
docs/standard/base-types/choosing-between-anonymous-and-tuple.md	Choosing between anonymous and tuple types
docs/standard/base-types/parsing-datetime.md	Parse date and time strings in .NET
docs/visual-basic/language-reference/runtime-library-members.md	"Runtime Library Members"