test: cover real package read-write overlaps

[wan9chi]

Summary

• add minimal real-package fixtures for tsdown cleanup and shebang handling
• reproduce declaration self-resolution through rolldown-plugin-dts
• reproduce Tailwind output comparison and oxfmt in-place formatting
• snapshot the exact read-write overlap path reported by Vite Task
• link each scenario to the pinned upstream implementation that performs the overlapping operations

Why

These cases capture the read-write overlap patterns observed in EmDash builds and in-place formatters using the real package implementations. They provide executable snapshots for the current cache behavior without adding manual input or output configuration.

Impact

Test-only coverage. The added packages are dev dependencies used by ignored e2e tests after the repository pnpm install.

Validation

• pnpm install --frozen-lockfile
• pnpm exec vp fmt --check
• just check
• cargo test -p vite_task_bin --test e2e_snapshots -- --ignored real_package_read_write_overlaps
• cargo test -p vite_task_bin --test e2e_snapshots

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​tailwindcss/​cli@​4.3.1
	npm/​tsdown@​0.20.3

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