Harden DGX Spark digital humans and add Casual Girl adapter

[Patvscode]

What changed

• runs the packaged UE 5.8 Ada/Aoi digital-human application natively on DGX Spark ARM64 while keeping Editor/cooking work isolated
• connects Fay speech and semantic events to StreamingADA, reviewed character profiles, deterministic fallbacks, and buffered ARDY body motion
• adds the source-only ARDY v30 migration guards and Editor foundation for a proper Core27 IK Retargeter path
• adds an exact CasualGirl / UE5EpicArkit profile and a separate source-only ARKit morph driver for the selected free Fab character
• makes cook, package, capture, and soak verification adapter-aware without weakening Ada/Aoi rollback checks
• preserves source-only publication boundaries: no Epic/Fab content, checkpoints, cooked packages, private media, or credentials are committed

Why

The current sealed v29 runtime works on the Spark, but its legacy late body-transform writer is not the motion architecture to extend. The v30 source candidate establishes the safer Core27/IK-retarget contract and guarded service migration while leaving the production package untouched.

The selected Fab character is not a MetaHuman. It therefore needs its own Epic-skeleton body retarget and Apple/Unreal ARKit morph adapter. The new runtime split keeps Ada/Aoi on the proven MetaHuman Live Link path and routes only the exact reviewed Casual Girl wrapper to the direct ARKit component.

User and developer impact

• Ada remains the live default and immediate rollback.
• A future package can include Ada plus Casual Girl and select either by sealed profile ID.
• Casual Girl speech has a real-time smoothed morph fallback for jaw, mouth shape, smile, and blink; arbitrary morph or asset paths are rejected.
• Qualification tools now recognize the correct adapter in log evidence and reject near-match or injection-shaped character IDs.
• The free Fab asset must still be acquired privately, audited, retargeted, cooked, and visually qualified before any live switch.

Validation

• full source-safety and repository suite passed: 144 tests with 15 expected skips
• secondary focused suite passed: 25 tests with 4 expected skips
• 41 focused Casual Girl/profile/package/capture tests passed during implementation
• shell syntax and git diff --check passed
• the existing sealed v29 live service was not changed

Remaining gates

• acquire the free asset through the user's Epic/Fab library and import it into the sealed staging project
• audit exact skeleton, components, all facial morphs, garments, hidden body regions, LODs, cloth/hair physics, and UE 5.8/LinuxArm64 compatibility
• build the private wrapper and Casual Girl-specific ARDY IK Retargeter assets
• compile and cook a new ARM64 package containing Casual Girl plus Ada rollback
• pass front/side motion review, speech/face checks, wardrobe transitions, failure recovery, and a 30-minute soak before changing the production default

Epic/MetaHuman/Fab assets, StreamingADA models, ARDY checkpoints, cooked packages, screenshots, videos, logs, private endpoints, credentials, and Engine source remain outside this public repository.