[M2-S7] Crab: creep, rear, stab #46

User story

As a player, I want the crab hexapod to creep up and stab, so that the high route has a different threat.

Acceptance criteria

• Creeps toward you, can walk under decks
• Front legs raised 0.6 s, then a stab
• 4 hits; collapse, then black fluid

Design and references

05 – Regular enemies. Cut 5th if late (keep rovers only).

Dependencies

Suggested owner: Vatsal (player and combat code).

Verification

Beat a crab on a deck from above with the up attack.