Sync CLI with Static Studio and prepare 0.1.5

[patrickposner]

Summary

• sync the CLI with current Static Studio contracts for Site Health, alerts, deployments, reports, environments, domains, SEO, IndexNow, rollbacks, and mounted sites
• replace client-side AWS uploads with the authenticated presigned multipart protocol and remove AWS SDK runtime dependencies
• harden domain, authentication, validation, team, redirect, cache, and site provisioning workflows
• add comprehensive command documentation, regression tests, changelog, and 0.1.5 release metadata

Cross-repository compatibility

• use static_site_record_id for magic login, matching the canonical Lagos field
• recognize numbered staticN.studio environment hosts
• use the canonical stored site URL for PageSpeed requests

Validation

• npm ci
• npm run typecheck
• npm test (136 tests)
• npm run build
• npm audit --audit-level=high
• npm pack inspection and clean tarball install smoke
• static-studio and sss binary smokes
• package library import smoke

Release

NPM package version 0.1.5 is prepared. Publication and the v0.1.5 tag will follow the squash merge from the exact merged main commit.