Move the completed 2026-09 candidate review (MODLIST-REVIEW/-GROUPS,
CANDIDATE-APPENDIX, PACK-CONTEXT), FINDINGS.md and the shipped FTB Chunks swap
write-up into analysis/archive/, with a README mapping their old paths. The
review's build pieces, subagent intermediates and Modrinth API dumps are
deleted: the assembled reports carry their content. MODLIST-GROUPS.md was a
byte-for-byte duplicate of analysis/groups-table.md.
Also: drop the now-pointless FINDINGS/MODLIST packwizignore lines (analysis/
covers the archive), and gitignore *.tar.gz so the 650 MB map-migration world
tarball can't be committed by accident.
The swap does not carry players' explored terrain across. FTB Chunks stores no
rendered map (its region zips hold chunks.dat plus five data PNGs, one of which
packs height into an image channel), and Xaero's region format is closed and now
version 6 with per-pixel NBT blobs, so the community converters no longer work.
Rather than convert pixels, prune a copy of the world save down to exactly the
chunks a player revealed and let Xaero's own generator map it.
Validated against real data: extracting the 167-region / 98,170-chunk mask
cross-checks clean against FTB's own pixel data, and Anvil pruning round-trips
byte-identically (15.7 MB -> 471 KB on a live region file, slot-to-chunk mapping
confirmed against 1024 chunk NBT headers).
Deferred for now: needs the world save and one singleplayer pass per player.
See analysis/FTB-XAERO-MAP-MIGRATION.md.
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