DATA-4391: Fix Kitsune starting age and aging milestones

[cpstence]

Issue:

• The PCGen engine erroneously treated age 7-14 as the adult age range for Kitsune characters, and treated anything past 15 as "middle-aged"[cite: 4].
• The engine evaluated age 0 as a "youth" category, which automatically applied round-the-board -2 stat modifiers[cite: 4].
• The Everyman Gaming Kit Compendium forced subtype traits to be mandatory rather than optional[cite: 4].

[cpstence]

Fix:

• Cleared illegal AGE tags from the main race definition in kitsune_races.lst.
• Rewrote the demographic brackets in kitsune_biosettings.lst to remove the Undefined (0) and Youth (7) tiers. Kitsune adulthood now correctly begins at BASEAGE:15 to align with standard Pathfinder milestone math.
• Injected a None (Standard Paizo Kitsune) choice into the Kitsune Racial Subtype ability pool in egkc_abilities_race.lst. This creates a clean opt-out path so players can select the base race without triggering validation errors from 3rd-party clan requirements.

[github-actions]

🚧 PCGen Code Coverage

Overall Project	25.99%	❌

There is no coverage information present for the Files changed