ENH: Convert ExternalData .md5 tags to .cid (IPFS content IDs)

[hjmjohnson]

Migrate ExternalData content-link stubs from legacy md5/sha512 hashes to IPFS .cid tags, aligning this remote module with the ITK-wide CID migration.

Verification

• Based on current origin/main.
• 15 .cid files introduced; sibling .md5/.sha512 stubs removed.
• Change is data-link metadata only — no source or CMake changes.

[dzenanz]

Looks good on a glance.

[dzenanz]

I restarted the CI. The error was:

-- Fetching "https://insightsoftwareconsortium.github.io/ITKTestingData/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "https://data.kitware.com:443/api/v1/file/hashsum/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq/download"
-- Fetching "https://itk.org/files/ExternalData/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "http://127.0.0.1:8080/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "https://ipfs.io/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "https://gateway.pinata.cloud/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "https://cloudflare-ipfs.com/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
-- Fetching "https://dweb.link/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq"
CMake Error at /.../ITK/CMake/ExternalData.cmake:1169 (message):


  Object CID=bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq not
  found at:

    https://insightsoftwareconsortium.github.io/ITKTestingData/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq ("HTTP response code said error")
    https://data.kitware.com:443/api/v1/file/hashsum/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq/download ("HTTP response code said error")
    https://itk.org/files/ExternalData/CID/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq ("HTTP response code said error")
    http://127.0.0.1:8080/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq ("Could not connect to server")
    https://ipfs.io/ipfs/bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq ("HTTP response code said error")

[hjmjohnson]

Network Hiccup?

./ITK_REMOTE_MODULES_STABLE/Utilities/Maintenance/RemoteModuleIngest/verify-cid-access.sh GrowCut                                                                   
==> Checking 15 .cid content-link(s) under GrowCut (jobs=16)...
OK   bafkreicld5iuqeezy47xihiy5i2paqnwt2qnishckamikkw3wueajjivyi  (cached)
OK   bafkreicgctc76j4jrhaf3hsxhsmuq6vxlz36uc23ocdyd3pkb7ccuf54tu  (cached)
OK   bafkreifjggyfldj2jsw3k5l3mfsr6mqfh2yyoinqjjqlplbfffmtmemutq  (cached)
OK   bafkreiahdirdqbk2olk4rskxt4t6agizq33hygxfjfilws2n6hanlb54y4  (cached)
OK   bafkreiarik4mbgc7sqcsloocpojee2ohlqxlx2gigwinhlocaj5l3bbroe  (cached)
OK   bafkreidsograzswdjam34vemy3cj22hnkd3sa6qq3syupflvg3xrplufgm  (cached)
OK   bafkreigs5sukusnln2cogn527zu5bj5pmme2g2yasq3t63xqiarj5vas3e  (cached)
OK   bafkreifbfmols4ggdif45pusn6mpx6jzrnvj2hhzfqylsefrhow52l6orq  (cached)
OK   bafkreieceovqkvvogpvhnxb7dpha7cdajgxp5rml7ht3wpj67kosvvxply  (cached)
OK   bafkreib5ekp2j4ehdcqzpgajakxgrbftwcnkmpjw7vwmwctsk2orlc2wdi  (cached)
OK   bafkreihbqzvxjkamm3xydp4tlxq5nfjzfro3z3y33grqz347y4dh4ui4oa  (cached)
OK   bafkreicwnhwnk3ogvn4ac5kipwcsgdlbvhevgbksawg4xfg5cc43nzyjv4  (cached)
OK   bafkreialv3a7ndrsgwchezzgjq2ev5vlqi3fv6lmyya5djjdpnxwxrwep4  (cached)
OK   bafkreif4y5ck4njwjg2jp77zy3pny4hmcgg4wh4km2phj77knqghcg6i3u  (cached)
OK   bafkreigitizm3h42et6pk6yvdqmcpsu27ec3pgaetkrvxcmx36raabrvjq  (cached)
==> All 15 .cid content-link(s) resolved from at least one gateway.