2026-08-31 (artifact naming) - standardized release asset names across CI workflows and frontend (D279)

Standardized artifact and GitHub Release asset names across the repository:

• payload: obscene-payload.elf (staged to dist/obscene-payload.elf, uploaded as obscene-payload.elf).
• injector: obscene-injector.elf (staged to dist/obscene-injector.elf, uploaded as obscene-injector.elf).
• module: obscene-module.elf (staged to dist/obscene-module.elf, uploaded as obscene-module.elf).
• eboot: obscene-eboot.zip (containing eboot.bin, uploaded as obscene-eboot.zip).
• pkg: obscene.pkg (staged to dist/obscene.pkg, uploaded as obscene.pkg).

Updated:

• .github/workflows/ci.yml: Added artifact-injector job, updated all upload-artifact jobs to publish explicit release filenames.
• frontend/web/index.html: Added assetLabel() to map release asset filenames to user-facing badges/labels (Payload (.elf), Injector (.elf), Package (.pkg), Eboot (.zip), Module (.elf)).
• Makefile: Updated payload rule to output $(BUILD)/obscene-payload.elf (maintaining backward-compatible copy to obscene.elf), updated shapes summary.
• docs/ARTIFACTS.md & docs/BUILDING.md: Updated tables to reflect canonical filenames.
• scripts/payload-run.sh & scripts/build-all.sh: Updated path lookups to prefer obscene-payload.elf.