feat(addons): pass setup defaults to dependencies

[LudoLoops]

Summary

• Expose resolved add-on options (including defaults) to setup, so an add-on can conditionally compose dependencies based on its selected mode.
• Let dependsOn(id, defaults) provide typed defaults for automatically added official add-ons. Defaults do not override options when the dependency was explicitly selected; conflicting sibling defaults remain unanswered for the normal prompt.
• Add coverage for setup values, dependency option resolution, explicit selection, nested defaults, and conflicting defaults.

This is needed for conditional composition in SvelteForge's dashboard addon: only the dashboard variant should automatically add official Drizzle and Better Auth, with PostgreSQL settings, while the base variant remains auth-free. Related upstream request: #1219. Related consumer issue: lelabdev/svforge#547.

Validation

• pnpm build — passed
• pnpm --filter sv check — passed
• pnpm lint — passed
• pnpm test --project core setup — 7 passed
• pnpm test --project cli add — 4 passed
• pnpm test — 511 passed, 29 skipped; 8 failures were environment-related: Playwright browser binary unavailable, plus unrelated full-project CLI fixture timeout and pnpm version mismatch (11.27.0 vs repository-required 11.28.3).

[pkg-svelte-dev]

Install the latest version of sv from 8db1412:

pnx https://pkg.svelte.dev/sv/c/8db141280dbe0fa863c8b0fc3c260f49d05b7e05 create

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1419

Note

This PR is from a fork. A maintainer must approve approve each commit before it can be built and installed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8db1412

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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