docs(roadmap): track post-migration mod follow-ups

Two follow-ups from the packwiz→04-mods migration: curate cosmetic-client
entries in mods-sides.json, and rework the landing join flow off the dead
packwiz pack.toml URL onto the HeliosLauncher/distribution.json flow.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -125,6 +125,20 @@ mirrored at apex `/launcher/`. Per guest:
 
 ## Open / Pending Work
 
+### Roadmap — mod migration follow-ups (post packwiz→04-mods)
+- [ ] **Curate `mods-sides.json` cosmetic-client mods.** tomllib auto-flagged 11
+  hard client-only mods; the other 65 default `both`, including client-cosmetic
+  ones (BetterF3, entityculling, MouseTweaks, ponderjs, fancymenu, drippy, melody,
+  welcomescreen, Searchables, JustEnoughResources, TravelersTitles, yeetus…) that
+  load harmlessly on the server but waste RAM. Hand-edit them to `client` so
+  `sync-server-mods.sh` drops them from `./server-mods`. (Also review `appleskin`,
+  flagged `client` — flip to `both` if server-side food data wanted.)
+- [ ] **Rework the landing join flow off packwiz.** `pack.` vhost is gone;
+  `site.ts packwizUrl` is a dead-URL placeholder (kept w/ TODO so the build
+  passes) and `i18n/ui.ts` join steps (all 3 langs) still tell guests to import
+  `pack.toml`. Redesign step 3 around the HeliosLauncher/`distribution.json`
+  install flow. See `plan/04-mods.md` + `site.ts` TODO.
+
 - [ ] **Mod shortlist** for the kitchen-sink pack: Performance (Embeddium,
   FerriteCore, ModernFix), Tech (Mekanism, Create, IE, AE2), Magic (Ars Nouveau,
   Botania, Iron's Spells), Storage (Sophisticated, Functional), Exploration