refactor: organise assets, tidy player.gd, unbreak fresh import

Assets grouped by role, within the constraint that FBX materials resolve
their textures by path relative to the FBX itself (verified by forcing a
reimport and reading back the albedo paths):

  assets/level/   scene.fbx + Level1_v1.fbx + the platform maps they look
                  up as siblings
  assets/logos/   the three attribution logos
  assets/         chara_red.fbx, background.fbx — these reach up into
                  ../sourceimages and so cannot move
  sourcefiles/    scene.blend, behind a .gdignore

The .blend move is a bug fix, not tidying. Godot hands every importable
.blend to a headless Blender, and that call never returns on this project
— a fresh clone stalls on first import, and the machine still had orphaned
Blender processes from an earlier attempt. Nothing loads the .blend: the
level geometry is baked into level_1.tscn.

player.gd: spell out ct/bt/d/ix/a, type the physics step, group the
members, and point the blue skin at sourceimages/low_blue_mat_* — the same
files assets/Chara_blue/ was a byte-identical copy of.

Co-Authored-By: Claude Opus 5 <[email protected]>

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assets/logos/git_logo/LICENSE.txt

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+Git Logo
+Copyright (c) Jason Long
+
+This work is licensed under the Creative Commons Attribution 3.0 Unported
+license (CC BY 3.0): https://creativecommons.org/licenses/by/3.0/
+

assets/logos/godot_engine_logo/LICENSE.txt

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+Copyright (c) 2017 Andrea Calabró
+
+This work is licensed under the Creative Commons Attribution 4.0 International
+license (CC BY 4.0 International): https://creativecommons.org/licenses/by/4.0/

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assets/logos/plugin_logo/LICENSE.txt

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+Copyright (c) Marek Belski
+
+This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
+license (CC BY-NC-ND 4.0 International): https://creativecommons.org/licenses/by-nc-nd/4.0

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