[generator] — for lsystem

Key	Type	Notes
axiom	string	Starting string. Required, non-empty.
rules	table k = "v"	Each key a single character (the predecessor). Required.
angle_deg	number	Turn angle for +/-. Default 25.
max_depth	integer	Iterations to precompute; clamped to 1..=7. Default 4.
seed	integer or "random"	The salt for hash()/noise() — see Seeded randomness. Not an L-system key: the expansion is deterministic and ignores it, and any system’s preset may declare one. Default 0.

Turtle vocabulary in the expanded string: F/G draw forward, f moves without drawing, +/- turn by angle_deg, [/] push/pop the branch state, any other character is an inert grammar variable.