Implement all Go By Example topics in .NET (C#, VB.NET, F#)

[Copilot]

Adds 83 new example directories covering every topic from the Go By Example checklist, each with idiomatic .NET equivalents in three languages.

Structure

Each example follows the existing hello-world convention — one directory per topic containing:

• *.csx — C# script
• *.vb — VB.NET script
• *.fsx — F# script
• *.bat — runner instructions

Coverage

Category	Examples
Basics	Values, Variables, Constants, For, If/Else, Switch, Arrays, Slices, Maps
Functions & Types	Functions, Multiple Return Values, Variadic, Closures, Recursion, Structs, Methods, Interfaces, Enums, Generics, Struct Embedding
Concurrency	Goroutines → Task, Channels → System.Threading.Channels, Select → Task.WhenAny, Timeouts/CancellationToken, Worker Pools, Mutexes, Atomic Counters, WaitGroups, Tickers/PeriodicTimer
Error Handling	Errors, Custom Errors, Panic → throw, Defer → using/try-finally, Recover → try-catch
Standard Library	JSON, XML, Regex, Time/Epoch, Hashing, Base64, String Functions/Formatting, Templates
I/O & System	File read/write, Directories, CLI args/flags/subcommands, Env vars, HTTP client/server, Processes, Signals, Context → CancellationToken

Example mapping

// Goroutines → Task.Run
var t1 = Task.Run(() => F("goroutine"));

// Channels → System.Threading.Channels
var ch = Channel.CreateUnbounded<string>();
await ch.Writer.WriteAsync("ping");
var msg = await ch.Reader.ReadAsync();

// Select → Task.WhenAny
var completed = await Task.WhenAny(c1.Reader.ReadAsync().AsTask(), c2.Reader.ReadAsync().AsTask());

// WaitGroup → CountdownEvent / Task.WhenAll
var wg = new CountdownEvent(numWorkers);

The site generator processes all 84 example directories and produces 85 HTML files (84 examples + index).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Go By Example</issue_title>
<issue_description>

Discussed in #1

^{Originally posted by AlexHedley May 10, 2025}

Implement the following in .NET

• Hello World
• Values
• Variables
• Constants
• For
• If/Else
• Switch
• Arrays
• Slices
• Maps
• Functions
• Multiple Return Values
• Variadic Functions
• Closures
• Recursion
• Range over Built-in Types
• Pointers
• Strings and Runes
• Structs
• Methods
• Interfaces
• Enums
• Struct Embedding
• Generics
• Range over Iterators
• Errors
• Custom Errors
• Goroutines
• Channels
• Channel Buffering
• Channel Synchronization
• Channel Directions
• Select
• Timeouts
• Non-Blocking Channel Operations
• Closing Channels
• Range over Channels
• Timers
• Tickers
• Worker Pools
• WaitGroups
• Rate Limiting
• Atomic Counters
• Mutexes
• Stateful Goroutines
• Sorting
• Sorting by Functions
• Panic
• Defer
• Recover
• String Functions
• String Formatting
• Text Templates
• Regular Expressions
• JSON
• XML
• Time
• Epoch
• Time Formatting / Parsing
• Random Numbers
• Number Parsing
• URL Parsing
• SHA256 Hashes
• Base64 Encoding
• Reading Files
• Writing Files
• Line Filters
• File Paths
• Directories
• Temporary Files and Directories
• Embed Directive
• Testing and Benchmarking
• Command-Line Arguments
• Command-Line Flags
• Command-Line Subcommands
• Environment Variables
• Logging
• HTTP Client
• HTTP Server
• Context
• Spawning Processes
• Exec'ing Processes
• Signals
• Exit</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Go By Example #11

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