[Excurs1ons]

🤖 Generated by Antigravity (Google DeepMind)

Summary

Implement Option A from #168: Make TypeDesc::schema_hash registry-aware (&TypeRegistry), recursively hashing nested struct schemas.

• Updated TypeDesc::schema_hash(&self, registry: &TypeRegistry) -> u64 to recursively hash nested struct schemas looked up from the registry.
• Added recursion cycle detection with a visiting set (HashSet<TypeId>) to safely terminate on recursive or mutually recursive schemas.
• Added TypeDesc::schema_hash_standalone(&self) -> u64 for registry-free hashing of leaf types.
• Added TypeRegistry::register_desc(&mut self, desc: &'static TypeDesc) for direct schema registration.
• Updated crates/prism-scene/src/rscn.rs encode/decode call sites to pass registry.type_registry().
• Added unit tests in prism-reflect verifying nested struct schema changes alter the outer schema hash, nested structs inside containers (List, Optional, Array) are covered, and recursive schemas terminate properly.

Fixes #168

Self-check (scripts/pr_ready.py)

• mode: full · base: origin/master · HEAD: 8897f24 · changed: 3 file(s)
• crates: prism-reflect, prism-scene

Check	Result	Detail
whitespace / conflict markers	✅	clean
artifact / secret guard	✅	3 file(s) checked
format (changed .rs)	✅	3 file(s)
clippy (2 crates)	✅	-D warnings
test (2 crates)	✅	83 passed
shader bindings drift	⏭️	no shader changes
editor fixture drift	⏭️	schema untouched
editor build	⏭️	editor untouched

Result: ✅ all checks passed

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-27T17:30:11.223057Z We couldn’t complete this review. Comment @codex review to try again.	8897f24	PR opened

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