Pare 0.3.0

Upgrading from 0.2

• Web projects now get their .js under obj/ by default; set PareOutDir to keep 0.2's
  output next to each source.
• Delete the .js files 0.2 generated in wwwroot (warning PARE200 names each one until you
  do), and drop any .gitignore rules for them.
• A .ts file added while dotnet watch runs is served after the next build (Ctrl+R); edits to
  existing files reload as before.

Changes

• Web projects: Extrode.Pare.Build writes the output of wwwroot/**/*.ts under
  obj/<configuration>/<tfm>/pare/ and registers it as static web assets (served, compressed and
  published as before), instead of next to each source. Breaking for anything that read the .js
  from wwwroot on disk. PareOutDir turns it off. A foo.js left next to foo.ts is not served
  and gets warning PARE200.
• docs/error-codes.md: every diagnostic (PARE001, PARE100-PARE107, PARE200) with an example
  that triggers it, why, and what to write instead. README links it.
• The build deletes the output of a deleted source; so does AddPareDevelopment while the app
  runs. AddPareDevelopment writes where the build does, read from
  Extrode.Pare.development.json in the build output. A source added during dotnet watch is
  served after the next build.
• Extrode.Pare.Build runs under Visual Studio 2026's MSBuild (MSBuild 18, .NET Framework) in the
  .NET task host, without MSBuild's out-of-process fallback warning.