[Mkhurana3]

What and why

Adds one "Open" bullet to Ocarina of Time's note (dm/games/0400486024DEC000/README.md) with what an M2 MacBook Air (16 GB) shows on the Saria-cutscene GPU hang tracked in #1326 (reported first as #1690, closed as a duplicate), and on the opt-in workaround in #1842. It changes no code and does not depend on #1842 being merged: the bullet says that switch is not on main.

• From the autosave just before Saria gives Link the ocarina, 6 of 6 runs died within 158-241 s on main 1794a35a (a GPU hang, then a revoked GPU).
• With DM_NVN_ISOLATE_TASK=1 from Ocarina of Time: opt-in task isolation (DM_NVN_ISOLATE_TASK), the Hi-Z task a5288 in command buffers of its own, a workaround for its GPU hangs on an M1 #1842, two runs of about 8 and 12 minutes (100,001 and 480,001 isolated draws of task a5288d0a6c4971fd) had no ErrorHang. That is two runs, not a controlled count.
• Switch off against on, same route, render scale 0.75, the same 3,600 frames of the cutscene (one pair, played by hand; both runs stopped before the area change, so it says nothing about hangs): the GPU p50 per 300 frames averaged 47.7 ms off and 52.2 ms on, but the other ten windows differ by about 0.01 ms each and the whole gap sits in two slow ON windows (one with pipeline compiles, one without), so it is not a clean cost of the cuts. Neither setting held 30 fps there (GPU p50 about 35-70 ms). Ocarina of Time: opt-in task isolation (DM_NVN_ISOLATE_TASK), the Hi-Z task a5288 in command buffers of its own, a workaround for its GPU hangs on an M1 #1842's author asked for this comparison on an M2; the raw tables are in my comment there.
• Freezes a player sees were first-use compiles: three a5288d0a6c4971fd pipelines took 7.0, 7.1 and 10.5 s; the maintainers say the task and its meshes are not in the prebuilt mesh lists, so they compile in-game (Ocarina of Time (0400486024DEC000 v131072, Mac): GPU hang about 10 minutes into play takes WindowServer down #1326).

Checked

• Tests: none run; the change is one line in a game note (CI covers the docs build).
• Games run, with title ID and version: Ocarina of Time 0400486024DEC000 v131072. The unfixed runs are six from the Saria autosave. With the switch, runs of about 8 min (render scale 1.0) and about 12 min (0.75). The off/on pair is about 90 s of the cutscene each. All numbers are from the host logs (timing up to frame, [longframe] and task / mesh pipeline lines).
• Devices and OS: Apple M2 MacBook Air, 16 GB, macOS 27.2.
• Measurements before and after: the off/on pair above; its limits are in the bullet.

Docs

• The finding is in its game note. python3 dm/tools/docs_symptoms.py was not run: nothing was added to a docs/reference entry, only the game note.
• A chain tool changed: not applicable.
• No game files, keys or data extracted from a game in the change or the attachments