Document project architecture and asset provenance

CREDITS.md

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+# Credits
+
+## Project direction
+
+NETfishing is designed, directed, reviewed, and released by its project
+creator. A public-facing creator or studio credit has not yet been recorded in
+this repository.
+
+## Development assistance
+
+Development has used automated coding assistance for implementation,
+investigation, testing, documentation, and review. Design choices, supplied
+artwork, acceptance decisions, repository operations, and releases remain
+human-controlled.
+
+This disclosure is intentionally about process. Commit style, code style, or
+repository metadata cannot reliably prove whether a particular change was
+written with or without assistance.
+
+## Fonts
+
+- Tuffy: Thatcher Ulrich, Karoly Barta, and Michael Evans. The bundled license
+  dedicates the work to the public domain; see `ui/fonts/Tuffy-LICENSE.txt`.
+- Seattle Avenue: bundled as `ui/fonts/seattle_avenue.otf`. Author and
+  redistribution terms still need to be recorded before public distribution.
+
+## Music
+
+- `audio/music/title/as_in_four_wolves.ogg`: original title/ambient music by
+  the project owner.
+
+## Sound effects
+
+- “Spinning reel.wav” by tosha73, used as the source for the fishing fight and
+  manual-reeling loops. Freesound sound 509902, Creative Commons Zero (CC0):
+  https://freesound.org/s/509902/
+- “Gentle Ocean Waves Loop” by kkenny101, used for the saltwater shoreline
+  ambience. Freesound sound 852826, Creative Commons Zero (CC0):
+  https://freesound.org/s/852826/
+- “Quick Water Droplet” by qubodup, used for the bobber water-impact sound.
+  Freesound sound 792931, Creative Commons Zero (CC0):
+  https://freesound.org/s/792931/
+
+## Artwork
+
+- 2D artwork: Rheannon Eisworth, contributor.
+- 3D models: original work by the project owner.
+
+Asset categories and release-record requirements are listed in
+[`docs/ASSET-PROVENANCE.md`](docs/ASSET-PROVENANCE.md).