SOW v0.3.0

Changelog

• ae43a31 chore(release): package Apache-2.0 license
• 786dd70 chore(release): prepare v0.3.0
• 59fe783 ci: enforce quality and clean-delivery gates
• 5a0c00e fix(managed): safely GC case-folded manifest aliases
• f762f8c fix(plain): retain 32-bit RPMs in Pigsty mode
• 1e9b119 perf(managed): cache package facts and eliminate warm payload reads
• 9fc78d1 perf(managed): promote payloads as a bounded group commit
• fa23f6d perf(plain): rebuild metadata in one content pass
• a730729 perf(state): expand membership projections in one bulk query
• e2efd02 refactor(r2): decouple current publication transport
• f0f1a69 refactor: consolidate on the v2 repository core