Update Icod.CommandFramework to 2.1.0

[uniblab]

Update every direct Icod.CommandFramework package reference in Icod.LineEditor from 1.1.0 to 2.1.0, and follow the 2.x process extraction by linking Icod.Processes 1.2.0 into the assemblies that own process execution.

This PR updates direct Icod.CommandFramework references in:

• Icod.LineEditor.Ed.Shared;
• ed;
• red;
• sed;
• Ed.Shared.Tests;
• Ed.Tests;
• Red.Tests; and
• Sed.Tests.

Icod.Processes 1.2.0 is added to:

• Icod.LineEditor.Ed.Shared; and
• sed.

Those are the two production assemblies whose source consumes the process runner APIs extracted from Icod.CommandFramework. Small namespace-compatibility bridge files globally import Icod.Processes while keeping the former Icod.CommandFramework.Processes namespace resolvable for the existing source using directives; the implementation types come from Icod.Processes 1.2.0.

The lineeditor router has no direct Icod.CommandFramework or Icod.Processes package reference; it consumes dependencies through its project references to ed, red, and sed, so no redundant package references are added.

Current architecture documentation is updated to identify Icod.CommandFramework 2.1.0. Historical extraction/provenance documents are intentionally left unchanged.

No icon or package-artwork changes are included; those are reserved for the requested follow-up.