Change Watch Keyword to Bind

[RiverHeart]

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[Copilot]

Pull request overview

This PR renames the WPF DSL keyword Watch to Bind, updates module exports accordingly, and propagates the new syntax (Bind <Property> -To <StatePath> ...) across docs, examples, and tests to reflect the new public API.

Changes:

• Replaced Watch with Bind in the exported DSL surface (and added a test ensuring Watch is no longer exported).
• Updated examples/docs to the new Bind ... -To ... usage, including the keyword reference page.
• Adjusted related tests/examples to match current behavior (e.g., App content-host margin assertions) and added minor function metadata ([OutputType([bool])]).

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/modules/WPF/WPF.psd1	Updates exported function list: removes Watch, exports Bind.
src/modules/WPF/Tests/ImageViewer.Example.Tests.ps1	Updates example-content assertions from Watch to Bind ... -To ....
src/modules/WPF/Tests/DSL/App.Tests.ps1	Updates expected content-host margin values to match current App implementation.
src/modules/WPF/Tests/Bind.Tests.ps1	Renames coverage from Watch→Bind and asserts Watch is not exported.
src/modules/WPF/README.md	Updates README example usage to Bind ... -To ....
src/modules/WPF/Public/Helpers/Set-WPFWindowFullScreen.ps1	Updates comment to reference Bind callbacks.
src/modules/WPF/Public/Helpers/New-WPFObservableState.ps1	Updates help text to reference Bind instead of Watch.
src/modules/WPF/Public/DSL/Helpers/State.ps1	Updates help text to reference Bind instead of Watch.
src/modules/WPF/Public/DSL/Helpers/BindProperty.ps1	Clarifies docs about internal Binding creation and $this in scriptblock.
src/modules/WPF/Public/DSL/Helpers/Binding.ps1	Clarifies docs around when to use Binding vs BindProperty.
src/modules/WPF/Public/DSL/Helpers/Bind.ps1	Renames the keyword implementation Watch→Bind and changes the API to use -To.
src/modules/WPF/Examples/ReadmeExample/ReadmeExample.ps1	Updates example script to Bind ... -To ....
src/modules/WPF/Examples/ImageViewer/ImageViewer.DSL.ps1	Updates ImageViewer DSL usage from Watch to Bind ... -To ....
src/modules/WPF/Examples/ImageViewer/functions/Test-ImageViewerShouldNavigate.ps1	Adds comment-based help and [OutputType([bool])].
src/modules/WPF/Docs/KeywordReference.md	Updates keyword reference TOC/content from Watch→Bind and updates examples.

Comments suppressed due to low confidence (1)

src/modules/WPF/Public/DSL/Helpers/Bind.ps1:15

• In the help text, the description of the -To path still says the last segment is the observable property "to watch", which is inconsistent with the keyword rename to Bind. This makes the docs confusing for users learning the new API.