Folderbase Core v0.5.0

What's Changed

• docs: record Core v0.4.0 public proof by @jerelvelarde in #24
• feat(core): add metadata-only Folderbase capture planning by @jerelvelarde in #25
• feat(core): seal captures into transactional Local Head by @jerelvelarde in #26
• feat(core): seal productive tombstones safely by @jerelvelarde in #27
• feat(core): restore exact tombstone bytes without clobbering by @jerelvelarde in #28
• feat(core): ship the Folderbase 0.5 release candidate by @jerelvelarde in #32
• feat(core): unify migrations under durable transaction-v1 execution by @jerelvelarde in #33
• docs(release): record Core v0.5.0-rc.1 proof by @jerelvelarde in #38
• Add polished Folderbase README banner by @jerelvelarde in #39
• Anonymize the client fixture as Project 2 by @jerelvelarde in #40
• Add verified npx distribution for Folderbase Core by @jerelvelarde in #30
• Freeze Compatibility Contract v1 and publish stable CLI surface by @jerelvelarde in #42

Full Changelog: v0.4.0...v0.5.0