[nahime0]

IDELEPHC now replaces monsters with elephants and lets a human feeder toss carrots from slot 2. Full elephants flop onto their sides and sleep with animated zZzZ, while still counting toward level completion and unlocking boss exits.

• Add embedded elephant animation, carrot projectiles, a hand with throwing/recovery poses, and an original human portrait with a plain cap.
• Replace ranged attacks with contact damage and occasional charges with a visible warning, fixed direction, obstacle collision and recovery. Sidestepping avoids charges and feeding interrupts them.
• Preserve reversible toggles, saved sprite indices, the existing save schema, difficulty behavior and original combat when the mode is disabled. Retire hostile shots already in flight when enabling the mode.

Validation with elephc 0.27.6:

• make check: 16 tooling tests passed.
• make test: 122 gameplay tests passed, 1092 assertions.
• make: native SDL executable built successfully.
• git diff --check passed.
• Native real shareware E1M1 frames and generated art sheets were rendered and visually inspected, including the hand, portraits, sleeping elephants and charge warning/dash poses.