DMS Grammar Fix - Schematic Book Subject Rules (1.6)
Fixes the "Grammar unresolvable. Root 'subject'" spam that occurs when any merchant (e.g. VFE-Medieval Merchant Guild) attempts to stock a DMS_Schematic book.
Root cause: RimWorld 1.6's book system (Book.cs: AppendDoerRules) calls GrammarResolver.Resolve("subject", ...) against each ResearchProjectDef.generalRules returned by ReadingOutcomeDoerGainResearch.GetTopicRulePacks(). Several ResearchProjectDef entries in Dead Man's Switch have empty or missing generalRules and therefore provide no "subject" grammar rule, causing the unresolvable error on every stock-refresh attempt.
Fix: Adds minimal generalRules with subject / subject_gerund / subject_story rules to all affected ResearchProjectDef entries via XML patch.
