[rogeriojorge]

Stacked on #63, which is stacked on #62.

Problem

Each 1D example re-implemented the Hermite–Fourier initial state by hand: index arithmetic for Ck_0 and Fk_0, and a separate TOML file per scan. Users copied 60–130 lines to set up a case.

Change

• Two cases are now TOML files: input_1D_landau_damping.toml and input_1D_two_stream.toml describe their species physically and run with spectrax <file>. Their scripts shrink from 65 and 59 lines to 11 each: load, simulate, plot.
• Scans reuse the same files: the damping-rate and growth-rate scans set the box length per wavenumber with load_parameters(file, Lx=...). The growth scan also changes resolution and the seed with species={...} overrides. This replaces two duplicated TOML files and their index arithmetic.
• No pandas: the scans read their CSV references with NumPy.
• Orszag–Tang unchanged: its initial magnetic field is not a species description, so it stays a Python example.

load_parameters(input_file, **overrides) accepts any input or solver key, plus species={name: {...}}.

	Before	After
Lines in the 1D example scripts	375	78
Files in Examples	13	11

Checks

• Both examples run, and their automatic figures show Landau damping and the two-stream trapping vortex.
• The full suite passes.