Add namespace apidocs for API generation

Author: xoofx

src/XenoAtom.CommandLine.Terminal/apidocs/XenoAtom.CommandLine.Terminal.md

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+---
+uid: XenoAtom.CommandLine.Terminal
+---
+
+# Summary
+Terminal-focused output APIs and helpers that integrate XenoAtom.CommandLine with XenoAtom.Terminal and XenoAtom.Terminal.UI.
+
+# Remarks
+This namespace provides markup and visual output renderers, rendering options, and extension methods to generate richer help and diagnostics in terminal applications.
+

src/XenoAtom.CommandLine/apidocs/XenoAtom.CommandLine.md

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+---
+uid: XenoAtom.CommandLine
+---
+
+# Summary
+Core APIs to declare commands, options, arguments, validation, parsing, and execution for .NET command-line applications.
+
+# Remarks
+This namespace contains the main object model and helpers of XenoAtom.CommandLine, including `CommandApp`, `Command`, option/argument nodes, parsing diagnostics, validation helpers, and output abstractions.
+