[jpcottin]

Fourteen Google Test cases on behaviour the suite had not pinned down.

• Haptics: a bomb hit fires the haptic callback once, the last life and the invasion still do, a shielded hit and a power-up pickup do not.
• Idle screen: only the title, game over and win screens are idle (a round and the level-clear animation are not); the phone idles while the glasses play the round, the glasses instance itself does not.
• Effects: a hit shakes the screen at full strength and the shake settles within a second; a shielded hit shakes at half strength; a new level starts still; a caught power-up flashes its level-scaled value just above where it was caught and fades; a new game clears the flash.
• Tally: a new game resets level, lives, score, the shot counters, the power-ups, the high-score flag and the battlefield.

game.h gains debug-only accessors for the lives, the shake amount and the bonus flash. README test count 128 -> 142.

Verified: scripts/host-tests.sh 142/142; the Debug native build (NDK clang, game_tests for both ABIs) compiles.