chore: Rename the package to webship/patches and drop the cleanup commands

[Natshah]

Problem/Motivation

The package name repeats the vendor (webship/webship-patches), the PHP namespace and classes repeat it again (Webship\WebshipPatches\WebshipPatchesPlugin), and the repository still carried Vardot/Varbase naming in places the earlier sweep missed.

Separately, the package shipped two Composer cleanup commands and a v1 compatibility path for cweagans/composer-patches, neither of which Webship uses.

Proposed resolution

Rename

• Composer package webship/webship-patches → webship/patches (the GitHub repository is already renamed; the old URL redirects).
• PHP namespace Webship\WebshipPatches\ → Webship\Patches\.
• WebshipPatchesPlugin → PatchesPlugin, WebshipResolverProvider → ResolverProvider.
• Dependency webship/drupal-core-patches → webship/drupal-patches.
• Every patch file URL now points at the patches branch of webship/patches.

Remove the Composer cleanup commands

patches:cleanup:patches / :patches-file (web-ccup / web-ccupf) are gone, along with everything that existed only to serve them: the CommandProvider capability, CleanupPatchesCommand, CleanupPatchesFileCommand, Util\MrPatchProcessor, docs/commands.md and docs/migration-from-drush.md. src/ is now just the plugin, the resolver capability and FilteredDependencies.

cweagans/composer-patches ~2.0 only

The constraint narrows from "~1.7.0 || ~2.0" to "~2.0", and the v1 path is removed — it was a second implementation of the merge/allowlist/patches-ignore rules, duplicating FilteredDependencies and kept in step by hand. The ~1.7.0 leg of the CI matrix goes with it.

This part was previously #3, which was closed without merging. It is folded in here because you had asked for v2-only; if closing it was deliberate, say so and I will split it back out.

Housekeeping

Every remaining Vardot / Varbase reference is gone. .patch and .diff files were left untouched — they are immutable diffs whose checksums matter.

How it was tested

• All 34 rewritten patch URLs fetched and returned HTTP 200 at the new webship/patches location.
• php -l clean on every file under src/ and tests/; composer.json, tests/test.composer.json and the workflow YAML all parse.
• Full-text sweep for vardot, varbase, webship-patches, drupal-core-patches, WebshipPatches, ccup, CommandProvider, MrPatchProcessor and ~1.7 returns nothing.

Follow-up, not in this PR

• Submit webship/patches to Packagist. Per your call the old webship/webship-patches entry is left as-is rather than marked abandoned.
• The agents and skills in webship/ai-agents still reference the old package names — left alone deliberately, as agreed.

Checkpoints

• File an issue about this project
• Addition/Change/Update/Fix to this project
• Testing to ensure no regression
• Automated unit/functional testing coverage
• Developer Documentation support on feature change/addition
• User Guide Documentation support on feature change/addition
• Accessibility and Readability
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Update Release Notes
• Release

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