chore: .NET 10 housekeeping and doc correctness fixes

- Drop `dotnet workload install aspire` (devcontainer postCreate + template
  README prerequisite): .NET 10 ships Aspire as NuGet packages, no workload.
- DbMigrator is a console Generic Host, so its env gate reads DOTNET_ENVIRONMENT,
  not ASPNETCORE_ENVIRONMENT — fix the seed-demo refusal message + docs that told
  users to set the wrong variable.
- fsh CLI: the `new` example used the non-existent `--no-git`; use `--no-frontend`.
- CONTRIBUTING: Node.js 20+ to match both READMEs (was 22+).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: iammukeshm

.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
     "features": {
         "ghcr.io/devcontainers/features/docker-in-docker:2": {}
     },
-    "postCreateCommand": "dotnet workload install aspire && dotnet restore src/FSH.Starter.slnx",
+    "postCreateCommand": "dotnet restore src/FSH.Starter.slnx",
     "forwardPorts": [5030, 7030, 15888],
     "customizations": {
         "vscode": {

CONTRIBUTING.md

@@ -10,7 +10,7 @@ Thanks for helping out. The conventions below keep PRs reviewable.
 
 ## Dev setup
 
-Prerequisites: .NET 10 SDK, Docker, Node.js 22+.
+Prerequisites: .NET 10 SDK, Docker, Node.js 20+.
 
 ```bash
 dotnet build src/FSH.Starter.slnx

README-template.md

@@ -12,7 +12,6 @@ the shared code lives in `src/BuildingBlocks` and is yours to change.
 - [.NET 10 SDK](https://dotnet.microsoft.com/download/dotnet/10.0)
 - [Node.js 20+](https://nodejs.org) — for the React apps
 - [Docker](https://www.docker.com/) — Postgres, Redis, MinIO (orchestrated by Aspire)
-- .NET Aspire workload: `dotnet workload install aspire`
 
 ## Quick start
 

src/Host/FSH.Starter.DbMigrator/MigratorCommand.cs

@@ -66,7 +66,7 @@ apply           Apply pending migrations (default). Use --seed to also run SeedA
           seed            Run only the SeedAsync step per tenant.
           seed-demo       Provision the demo tenants (acme, globex) with users, catalog,
                           tickets, and chat. Dev-only — refuses to run unless
-                          ASPNETCORE_ENVIRONMENT=Development.
+                          DOTNET_ENVIRONMENT=Development.
           list-pending    Print pending migrations without applying anything.
 
         Options:

src/Host/FSH.Starter.DbMigrator/Program.cs

@@ -291,7 +291,7 @@ await Console.Out.WriteLineAsync(
         if (!env.IsDevelopment())
         {
             await Console.Error.WriteLineAsync(
-                $"[demo-seed] REFUSING to run — ASPNETCORE_ENVIRONMENT is '{env.EnvironmentName}'. "
+                $"[demo-seed] REFUSING to run — DOTNET_ENVIRONMENT is '{env.EnvironmentName}'. "
                 + "seed-demo is dev-only by design.")
                 .ConfigureAwait(false);
             return 1;

src/Host/FSH.Starter.DbMigrator/README.md

@@ -43,7 +43,7 @@ dotnet run --project src/Host/FSH.Starter.DbMigrator -- seed
 # Dev only — provision the demo tenants (acme, globex) with users,
 # custom roles, sample catalog, tickets, and chat. Hard-refuses outside
 # Development. Idempotent: safe to re-run.
-ASPNETCORE_ENVIRONMENT=Development \
+DOTNET_ENVIRONMENT=Development \
   dotnet run --project src/Host/FSH.Starter.DbMigrator -- seed-demo
 ```
 

src/Tools/CLI/Program.cs

@@ -18,7 +18,7 @@
     config.AddCommand<NewCommand>("new")
         .WithDescription("Create a new FullStackHero .NET project.")
         .WithExample("new", "MyApp")
-        .WithExample("new", "MyApp", "--no-aspire", "--no-git");
+        .WithExample("new", "MyApp", "--no-aspire", "--no-frontend");
 
     config.AddCommand<DoctorCommand>("doctor")
         .WithDescription("Check your development environment for required tools.");