Match Example 05 figures to MATLAB layouts

[iahncajigas]

Summary

• Rewrites all 6 Example 05 figures to match MATLAB's exact subplot layouts
• Fig 3: 4×2 grid — reach path with start/finish markers, neural raster, position/velocity traces, CIFs (was 2×2 state traces)
• Fig 4: 4×2 grid — 20 overlaid decoded reach paths (PPAF+Goal blue, PPAF green) (was RMSE box plots)
• Fig 5: 4×2 grid — hybrid reach path, 40-cell raster, position/velocity, discrete N/M state (was 2×1)
• Fig 6: 4×3 grid — 20-sim averaged state estimation, P(state), 2D reach path, per-dimension kinematics (was 3×1 single-sim)
• Uses MATLAB's minimum-energy reach trajectory instead of sinusoidal
• Loads hybrid fixture from HDF5 (paperHybridFilterExample.h5) with .mat fallback
• Adds paperHybridFilterExample.h5 and .mat fixture data to data_cache/nstat_data/

Test plan

• All 6 Example 05 figures generate without errors
• Fig 3–6 layouts visually match MATLAB counterparts
• Hybrid filter fixture loads correctly from HDF5
• CI passes all checks

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