@name gametools
@version 0.1.0
@author Ayaan
@description Game development toolkit — timers, input helpers, score tracking, animations, and sound effects.
@main main.ayaan
@help Available commands:
  TIMERS
    timer_start name frames          - start/reset a named countdown
    timer_tick name                  - decrement (call once per frame)
    timer_done name                  - returns 1 if expired
    timer_remaining name             - frames left
  INPUT
    key_pressed key                  - 1 only on edge (transition)
    key_released key                 - 1 only on release edge
    key_held key                     - 1 while held
  SCORE
    score_reset                      - reset current score to 0
    score_add n                      - add N to score
    score_get                        - returns current score
    highscore_load game              - load saved high score
    highscore_maybe_save game        - save if score > old high
  ANIMATION
    bob frame speed amp              - sine wave [-amp, +amp]
    pulse frame speed base amp       - positive pulse
    wobble frame speed amp           - mixed sine wobble
    shake intensity                  - random shake offset
    gt_lerp a b t                    - linear interpolation
    brightness_pulse frame speed base - pulsing brightness factor
  SOUND
    sfx_jump / sfx_coin / sfx_die / sfx_select / sfx_power / sfx_win / sfx_hit
