[Alpha Art] Shortlist Anime-Ready Semi-Real asset candidates

[JOY]

Source docs:

• docs/design/32-alpha-art-audio-and-content-direction.md
• docs/design/33-alpha-production-backlog.md

Goal:
Create a practical shortlist of asset candidates that can support Anime-Ready Semi-Real characters, enemies, Relay Yard props, and Gate environments without drifting into chibi, full Western PBR, or generic low-poly identity.

Acceptance criteria:

• Candidate table includes name, URL, price or license note, style fit, rig type, URP readiness, material count, texture tiers, LOD support, Web risk, animation compatibility, and decision.
• Covers at least player/NPC bodies, enemy/boss candidates, Relay Yard props or environment, and Gate interior candidates.
• Clearly marks packs as accept, reject, prototype-only, or needs import test.
• Does not require buying or importing anything.

Cut line:

• No final purchase decision.
• No marketplace scrape dump without human-readable evaluation.

[JOY]

Completed in PR #182. The alpha asset shortlist is now documented in docs/design/41-alpha-asset-shortlist.md and linked from the roadmap, systems index, GitBook summary, changelog, and art direction docs.