fix(test): classify runtime dependencies in test workspaces

[SnowSky1]

Summary

• move packages imported by executable test helpers and fixtures from devDependencies to dependencies
• update the workspace lockfile importer classifications
• restore the repository-wide lint:all gate

Validation

• pnpm lint:all
• pre-push hook: full workspace build, lint, and typecheck

The affected packages are private test workspaces, so no changeset is required.

[changeset-bot]

⚠️ No Changeset found

Latest commit: d11e05c

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commit: d11e05c

[SnowSky1]

@felixweinberger, when you have a chance, could you review this test-workspace manifest fix? It restores the current lint:all gate by classifying imports from executable helper/fixture source as runtime dependencies. The PR is mergeable and all CI checks are green; the packages are private, so it intentionally has no changeset.

[SnowSky1]

Status note: this PR was unintentionally left as a draft while I opened the stacked #2593 draft. GitHub now disables “Ready for review” for my external account because of the repository open-PR limit, and the API denies markPullRequestReadyForReview. The diff and CI are complete; if the approach looks right, could a maintainer mark #2592 ready (or review/merge it directly)? I’ll then rebase #2593 to remove this commit.

[SnowSky1]

Closing for the time being: repository permissions prevent me from marking this draft ready for review (the markPullRequestReadyForReview mutation returns FORBIDDEN for my account), and drafts cannot be merged, so I do not want it sitting idle in the review queue. The diff was complete and CI was green at close time; the branch fix/test-helpers-vitest-dependency is kept on my fork. Happy to reopen or resubmit if maintainers want this change or can restore draft-readiness for external contributors.