Add private repository visibility

{
  "backend": {
    "author": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1789743934
    },
    "commit": "git:sha1:5a76deb5ce3fe098181305e6f8c999d03c7014d2",
    "committer": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1789743934
    },
    "manifest": "mmm-manifest:sha256:577349bb04bfb1f27c6fac1ac4e716b2c8fb5f9e78c2b88bd314bafda4060ac9",
    "message": "Add private repository visibility\n\nPersist repository visibility and owner settings, enforce private access across web, archive, listing, and Git HTTP routes, and add a Public/Private choice to repository creation. Cover browser and Git authentication flows with integration tests.",
    "objectFormat": "sha1",
    "parents": [
      "git:sha1:f9716594a73aa026dac422d0ed13976b76344c14"
    ],
    "ref": "refs/heads/master",
    "summary": "Add private repository visibility",
    "tree": "git:sha1:40a507530b06cd8585dd5c437b8c95d2aa443202",
    "type": "git"
  },
  "issuedAt": "2026-09-18T15:20:25.396Z",
  "previous": "mmm-revision:sha256:75825c358b66f9582473a8363b5e7241a58e6b9d309206f0481e2885ceb05f56",
  "project": "mmm1v9jt2ea70h6zzr60ewwpuqz5ywf9wzreuxk70py7sfx7k0p5vszqqha9td",
  "protocol": "mmm/0-alpha",
  "sequence": 16,
  "type": "mmm/revision"
}