Staged installer set for Alpine Linux x86-64 (tinkerpad/ThinkPad T480).
Covers Base (Tier 0), Minimal (Tier 1), and Basic (Tier 2) tiers with
full phased structure, per-package error capture, and re-runnable test suites.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>