v0.6.21 — owned SM120 hybrid FFN capacity

Reuse the exclusively owned SM120 hybrid FFN base projection for its activated value half, instead of allocating another full output. The gate half and adapter remain unchanged, strict BF16 boundaries are retained, and the next linear consumes a strided view. Other architectures retain the allocated-output path. The owned contract is explicit and rejects autograd inputs.

On a 32 GB, 600 W RTX 5090, a seven-video integration completed 2048²/5 s in 451.039 seconds (26.982 GiB peak denoising allocation), 1536×864/15 s in 364.943 seconds (24.143 GiB), and 1440²/10 s in 392.383 seconds. The earlier 4.28 GiB FFN output allocation failure is avoided. Same-host 1920×1088/5 s A/B/A2 produced identical complete MP4 bytes; its denoising peak stayed 16.960 GiB and no speed gain was established. This is a capacity improvement, not a general speed or image-quality claim. Separate-host 500 W and 600 W runs do not isolate this optimization's latency effect. Full media decode, multi-time visual review and application playback accompany the integration; existing camera motion and unassessed audio semantics remain. Product routing is unchanged.

Private integration evidence: video-gen 3e20f9f3; only aggregate results are public. The promoted kernel also passed four real-GPU shape checks, including subsequent strided linear output without a hidden clone.

Validation: focused clean-source and installed-wheel checks; real RTX 5090 kernel probes; CI and bilingual Pages passed for commit 7c2eb5c7983c1fd64d1ba3e015866de666f6c708.