Allow mf.js to override feed contents, support 'main' as alias

{
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    "author": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1787500307
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    "commit": "git:sha1:3146094906cb4ee4d75aa3205fc97ce398e53ffb",
    "committer": {
      "email": "drschwabe@fastmail.com",
      "name": "Derrick Schwabe",
      "time": 1787500524
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    "ref": "refs/heads/alpha5d_mfm",
    "summary": "Allow mf.js to override feed contents, support 'main' as alias",
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  "issuedAt": "2026-08-23T16:31:52.155Z",
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