The directory was misnamed — these are wsid-triggered sorting-rule
overlays, not modpack-specific. HellDrinx happens to be a modpack but
RV Interior Expansion isn't; both use the same generic mechanism.
Renames:
data/modpack_rules/ → data/rules/
_MODPACK_RULES_* → _RULES_*
_modpack_rules_for → _auto_rules_for
_parse_rules_with_modpacks → _parse_rules_combined
_emit_modpack_rules_warnings → _emit_rules_applied_warnings
warning tag "modpack-rules-applied" → "rules-applied"
Bug fix: /api/resort was passing {} rules to sort_mods, silently
dropping every auto-injected rule. The frontend runs an automatic
resort after each /api/sort (driven by localStorage branchSelections),
so the user always saw the resort output — where rv_expansion.txt's
loadAfter chain wasn't taking effect. Now resort goes through
_parse_rules_combined and emits rules-applied warnings the same way
/api/sort does.