Add Japan 独走/下克上/政変 mechanics

Four uniquely Japanese political crisis mechanics:

1. 軍部独走 (Military Acting Alone): Hidden risk meter, random unauthorized military actions
   - Korea invasion without authorization, Sakhalin border provocation, Pacific NW clash
   - Player gets no warning, must endorse or disavow (both bad)
   - Risk rises with: military frustration, national humiliation, weak PM, economic downturn

2. 下克上 (Gekokujō): Junior officer assassinations of politicians/zaibatsu
   - Fires when military anger high + reform happening
   - Player chooses: crack down, appease, or ignore

3. 軍事政変 (Military Coup): Highest stakes event
   - Requires multiple trigger conditions simultaneously
   - Success → Showa-style military dictatorship
   - Failure → civilian reform opportunity but military weakened

4. 統帥権干犯 (Supreme Command Issue): Recurring blocker on military reform
   - Military cites Emperor's authority to block budget cuts/arms reduction
   - Only bypassed through Emperor's support or civilian control reform

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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