CLI: Add initial support for image tag command

[AmelBawa-msft]

Summary of the Pull Request

• Added support for wslc image tag

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[Copilot]

Pull request overview

This PR adds initial support for the wslc image tag command, which allows users to tag an existing container image with a new name/tag. It introduces a RepoTag::Parse utility for parsing image references (handling registry ports, slashes, and tags), wires up the CLI command through the existing command infrastructure, and calls the existing TagImage COM API on the session.

Changes:

• Added RepoTag model with Parse method to split image references into repo and tag components, and implemented ImageService::Tag to call the IWSLASession::TagImage COM API.
• Added ImageTagCommand CLI command with source/target positional arguments, registered in both ImageCommand and RootCommand.
• Added comprehensive E2E tests and unit tests for the new tag functionality and RepoTag::Parse.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/windows/wslc/services/ImageModel.h	Added RepoTag struct with Parse static method
src/windows/wslc/services/ImageModel.cpp	Implemented RepoTag::Parse for splitting image references
src/windows/wslc/services/ImageService.h	Changed Tag() from stub instance method to static with parameters
src/windows/wslc/services/ImageService.cpp	Implemented Tag using RepoTag::Parse and TagImage COM call
src/windows/wslc/commands/ImageCommand.h	Added ImageTagCommand struct
src/windows/wslc/commands/ImageCommand.cpp	Registered ImageTagCommand under ImageCommand
src/windows/wslc/commands/ImageTagCommand.cpp	Implemented ImageTagCommand execution logic
src/windows/wslc/commands/RootCommand.cpp	Registered ImageTagCommand as top-level shortcut
src/windows/wslc/tasks/ImageTasks.h	Declared TagImage task function
src/windows/wslc/tasks/ImageTasks.cpp	Implemented TagImage task
src/windows/wslc/arguments/ArgumentDefinitions.h	Added Source and Target positional arguments
test/windows/wslc/WSLCCLIRepoTagUnitTests.cpp	Unit tests for RepoTag::Parse
test/windows/wslc/e2e/WSLCE2EHelpers.h	Added AlpineTestImage, VerifyImageIsListed declarations
test/windows/wslc/e2e/WSLCE2EHelpers.cpp	Implemented AlpineTestImage and VerifyImageIsListed
test/windows/wslc/e2e/WSLCE2EImageTagTests.cpp	E2E tests for image tag command

[AmelBawa-msft]

@OneBlue, should the CLI be responsible for handling invalid target input, or should the service validate that the target options are present and valid? The REST API marks the Repo and Tag options as optional, so we might not see the same error behavior as the Docker CLI in WSL

Docker

PS C:\> docker images
IMAGE           ID             DISK USAGE   CONTENT SIZE   EXTRA
debian:latest   24fb189462d7        258MB          124MB

PS C:\src\wsl> docker tag debian:latest :mock
error parsing reference: ":mock" is not a valid repository/tag: invalid reference format

WSLC

PS C:\> wslc images
+---------------+-----------+
| NAME          | SIZE (MB) |
+---------------+-----------+
| debian:latest | 114.30    |
+---------------+-----------+
PS C:\> wslc tag debian:latest :mock
# Exit code: 0

[OneBlue]

@AmelBawa-msft: The service validates all the inputs it receives. If the CLI doesn't need to parse an input, it should let the service do it and handle errors

[Copilot]

Pull request overview

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