feat(intro): condensed tester teaching card so the short arc explains the loop

feat(lore): short world note keeps improvised dialogue consistent

feat(lore): OWN_FRAGMENTS become the deepening Caor/Gaunt arc

feat: intro card copy + per-mode sequence constants

feat: shorter varied replies + one consolidated memory per turn

feat: child escalates its plea for a real memory over barren turns

feat: safety nets + diegetic onboarding

feat: retune ending pacing (bad msg 6, good msg 12, neutral msg 12)

feat: tone bands, mimicry, and wound echo in system prompt