refactor: single source of truth for excluded packages

local/build-all.R had a 75-name hardcoded vector that drifted from
local/excluded-packages.json (RcmdrPlugin.ROC was in the R vector
but missing from the JSON). weekly-rebuild-missing-* already reads
the JSON, so this aligns build-all.R with that pattern.

- Add the missing RcmdrPlugin.ROC entry to excluded-packages.json
- Replace the hardcoded vector in build-all.R with
  jsonlite::fromJSON("local/excluded-packages.json")[["package"]]
- Pull jsonlite into the install-deps step so it's available in
  /mnt/cache/R-pkgs for the build step
- Drop the dead base64 SKIP_PKGS docs comment from
  build-all-versions-arm64.yaml; point to the JSON instead

local/build-all.R

@@ -21,23 +21,8 @@ chunks <- split(pkgs, cut(seq_len(nrow(pkgs)), split_into, labels = FALSE))
 chunk <- chunks[[split_index]]
 sprintf("# of package versions for this job: %s", nrow(chunk))
 
-# Exclude known problematic packages
-exclude <- c(
-  "RInno", "KeyboardSimulator", "R2PPT", "RWinEdt", "blatr", "excel.link",
-  "spectrino", "taskscheduleR", "MDSGUI", "BiplotGUI", "R2wd", "rFUSION",
-  "MediaNews", "doBy", "IDPmisc", "frailtypack", "afex", "FrF2", "DoE.base",
-  "agricolae", "doFuture", "fscaret", "PHYLOGR", "seewave", "pls", "relaimpo",
-  "geepack", "gggenes", "NPCirc", "repmis", "PNDSIBGE", "lidR", "poismf",
-  "neonstore", "MachineShop", "mvst", "MacBehaviour", "mcmcderive", "RGIFT",
-  "KnowBR", "netmeta", "spdep", "Rfast", "compareGroups", "ff", "GsymPoint",
-  "RcppDynProg", "comtradr", "FD", "PearsonDS", "DCluster", "gRc", "mixlm",
-  "geospt", "fdth", "ffmanova", "fiery", "ffscrapr", "cold",
-  "RcmdrPlugin.DoE", "RcmdrPlugin.NMBU", "RcmdrPlugin.RiskDemo",
-  "RcmdrPlugin.ROC", "RcmdrPlugin.TeachStat", "RcmdrPlugin.TeachingDemos",
-  "RcmdrPlugin.UCA", "RcmdrPlugin.WorldFlora", "RcmdrPlugin.aRnova",
-  "RcmdrPlugin.depthTools", "RcmdrPlugin.orloca", "RcmdrPlugin.sos",
-  "RcmdrPlugin.survival", "RcmdrPlugin.temis", "GWlasso", "GWmodelVis"
-)
+# Exclude known problematic packages (single source of truth)
+exclude <- jsonlite::fromJSON("local/excluded-packages.json")[["package"]]
 chunk <- chunk[!chunk$Package %in% exclude, ]
 
 # Read pre-computed S3 listing from install-deps step

local/excluded-packages.json

@@ -61,6 +61,7 @@
   {"package": "RcmdrPlugin.DoE", "reason": "hang"},
   {"package": "RcmdrPlugin.NMBU", "reason": "hang"},
   {"package": "RcmdrPlugin.RiskDemo", "reason": "hang"},
+  {"package": "RcmdrPlugin.ROC", "reason": "hang"},
   {"package": "RcmdrPlugin.TeachStat", "reason": "hang"},
   {"package": "RcmdrPlugin.TeachingDemos", "reason": "hang"},
   {"package": "RcmdrPlugin.UCA", "reason": "hang"},