[Blueprints] Share Git repository URL detection logic

[adamziel]

What it does

Moves the Blueprint v1 plugin URL heuristic into a shared internal helper: seemsLikeGitRepoUrl().

The v1 compiler still treats these as Git repositories:

https://example.com/project.git
https://github.com/owner/repo
https://gitlab.com/group/subgroup/project

Rationale

Blueprint v2 compilation also needs to distinguish Git repository URLs from direct download URLs and WordPress.org slugs.

Keeping the heuristic inside v1/compile.ts would force the v2 compiler to duplicate it or reach into v1 internals. This PR makes the logic reusable without changing v1 behavior.

Implementation

Adds src/lib/is-git-repo-url.ts and updates v1/compile.ts to call seemsLikeGitRepoUrl().

The helper intentionally keeps the existing allowlist-style behavior. It is not a general Git remote parser.

Testing instructions

npm run format:uncommitted
npm exec nx run playground-blueprints:test:vite -- --testFiles=packages/playground/blueprints/src/tests/is-git-repo-url.spec.ts
npm exec nx run playground-blueprints:lint
npm exec nx run playground-blueprints:typecheck
git diff --check

Part of #2592.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Extracts the Blueprint v1 Git repository URL heuristic into a shared helper (seemsLikeGitRepoUrl) so it can be reused by Blueprint v2 without changing v1 behavior.

Changes:

• Added a shared seemsLikeGitRepoUrl() helper under src/lib/
• Updated the v1 compiler to use the shared helper (and removed the inline implementation)
• Added unit tests covering accepted/rejected URL shapes and normalization

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/playground/blueprints/src/lib/is-git-repo-url.ts	Introduces shared allowlist-style Git repo URL heuristic used by compilers
packages/playground/blueprints/src/lib/v1/compile.ts	Switches v1 compilation logic to call the shared helper and removes the local function
packages/playground/blueprints/src/tests/is-git-repo-url.spec.ts	Adds test coverage for the new shared helper and its normalization behavior

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