Add Stripe checkout summary

{
  "backend": {
    "author": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1788882193
    },
    "commit": "git:sha1:a47bc927dcf39539a13004331f651358c48276b6",
    "committer": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1788882193
    },
    "manifest": "mmm-manifest:sha256:7e7e5803cbeb8302ff81f97785509b2a4afeec44267e5d4f40e19c84e4657958",
    "message": "Add Stripe checkout summary\n\nRender a server-backed order summary between Stripe Elements and the purchase button. Show the 00 list price, 10 percent early-access discount, and Stripe session total while keeping the final 0 charge authoritative.",
    "objectFormat": "sha1",
    "parents": [
      "git:sha1:f574b640d0ed2108ac778a0d986aa7c98d64b6d5"
    ],
    "ref": "refs/heads/master",
    "summary": "Add Stripe checkout summary",
    "tree": "git:sha1:7595e11cebe876c09bf2fdd4412c54a2ba6d0b24",
    "type": "git"
  },
  "issuedAt": "2026-09-08T16:23:09.361Z",
  "previous": "mmm-revision:sha256:710a48df1856545e43bd601dffca3de2a8934bcfb7e9d8547751e51fb4934557",
  "project": "mmm1u2jvtq5cct7u6e8ryks5kw9epc6wz7a4vvr7qzgtqh9j4lp4t7esywwc43",
  "protocol": "mmm/0-alpha",
  "sequence": 14,
  "type": "mmm/revision"
}