Rework init to be a job thing rather than a native command.

[tom-wolfe]

Added

• The tool client works the way the SDK does. IDotNet's tool methods are one per dotnet tool verb — ToolInstall, ToolUpdate, ToolUninstall, and InstalledToolVersion for list.
• The engine reads and writes project files. IProjectFiles and ProjectFile load a ritten.json as a document, set values by key path, and write it back with everything else intact.
• Ritten.GitHub maintains GitHub Actions workflows. IActionsWorkflows and ActionsWorkflow read a workflow file, find its jobs by what they run, and write a job or a trigger back into it without disturbing a line of the rest.
• Ritten.DotNet manages the tool manifest. IDotNet gains ToolUpdate and CreateToolManifest, and DotNetProjects reads what a repository holds.
• Jobs can declare that they run without a project. IJob.RequiresProject is what lets a job create the project file.
• Workflows can check compatibility. IWorkflow.IsCompatible answers whether a directory looks like its kind, and WorkflowRegistry.IsCompatible asks each in registration order.
• A file knows its directory, and a directory can place one. IFile.Directory returns the directory a file is in, so anything writing a nested file can create the path first, and IDirectory.RelativePath(file)/RelativePath(directory) write a path the way a project file spells one.

Changed

• ritten init is now a job instead of a command. It runs like every other job, with --dry-run, --verbose and the rest, and each workflow declares its own. A repository with no ritten.json yet has its workflow detected by what's in it, or --workflow sets one explicitly.
• Resolving a repository is its own step. WorkflowApplication.SelectWorkflow detects the workflow for a given directory.
• Workflows can run without a project file. RittenProject.Resolve answers with a synthetic project when nothing has been written yet.
• Init ensures rather than scaffolds. Every file it touches is loaded as a document, given whatever it's missing, and written back, so a changelog keeps its entries, a ritten.json keeps all its keys, a tool manifest keeps the other tools it pins, and an Actions workflow keeps its other jobs, triggers, and comments.
• The Actions workflow is named for the project, and found by what it runs. Ritten owns the jobs it wrote, not the file they live in: a renamed workflow file is updated in place rather than duplicated.

[github-actions]

✅ Ritten

✅ Version

Version 0.10.0 is valid (latest published: 0.9.0).

All 6 packages agree on 0.10.0.

✅ Metadata

All 6 packages carry everything a feed asks for.

✅ Changelog

Changelog entry for 0.10.0 is present.

✅ Tests

All 582 tests passed.

✅ Coverage

• Line coverage: 86.8%
• Branch coverage: 83.1%

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