WIKI: document the kernel patch series + 8-core module; ROCm/compute coverage; new APU TUI screenshot

[nightcarnage]

The WIKI tab is heavily oriented toward Vulkan/RADV and predates several shipped features. Gaps to close (facts can be supplied from the code/README; this is a tracking issue so they don't get lost):

1. Kernel patch series documentation. The series lives in crates/apu/patches/bc250-cachyos-7.0.9/ with a thorough SERIES.md — the WIKI should surface it: what each layer does (CU unlock, SDMA override, telemetry, TLB flush, GFXOFF/KIQ fixes) and what requires the patched amdgpu.
2. 8-core CPU unlock module. New cores suite with per-core control, the ability to deactivate the factory-set cores, and force-unlocking abnormal core layouts — plus the Core Map view of the shader-array topology. None of it is in the WIKI.
3. ROCm / compute coverage. The WIKI is RADV/Vulkan-centric; add the ROCm/KFD path (compute CUs, SDMA behavior, telemetry for compute workloads).
4. Fresh screenshot of the arieltune apu TUI. The existing screenshots predate the cores module / Core Map; a new capture is needed for the docs.

Suggested owner: maintainers/community; nightcarnage can supply the factual material (SERIES.md links, feature descriptions) on request.

[studebaker8]

Triaged, staying open as the wiki-coverage tracker. Items 1-3 (patch-series doc, 8-core/Core Map, ROCm/KFD path) are text that can be authored straight from SERIES.md + the cores module. Item 4 (fresh apu-TUI/Core-Map screenshot) needs a capture on a live liberated board, so it's gated on hardware access. Splitting the text work from the screenshot when someone picks this up.

[studebaker8]

Landed in 6a460f1 on main, mirrored to the internal arieltune repo.

The "wiki" here is the embedded OEM System Manual rendered in the arieltune WIKI tab (crates/bc250-catalog/src/bc250_manual.md), which was the Vulkan/RADV-focused, outdated material. Three of the four gaps are filled:

1. Kernel patch series: the Applied Patch Ledger is rewritten to the curated 01-28 series by layer (SMU/clocks/telemetry, the three-layer GPU-hang defense, the ROCm-safe 40-CU unlock, TTM crash containment + compute-defect probe, the TLB aliasing fix, 8-core telemetry), plus the discovery-path fixes 29/30; on-disk-not-applied set 12/19/21; SDMA now fixed by patches 26/27 (navi12 fw override + early trap, armed by default), patch 19 retired to fallback. The module-parameter box and ppfeaturemask (0xfff77ef7) are corrected too.
2. 8-core CPU unlock: new section covering the SMU core-presence mask (SMN 0x5A870, queue-3 msg 0x98), the state machine, the safety invariants, the arieltune apu cores CLI, the boot unit, and kernel patch 28 telemetry.
3. ROCm / compute: expanded the KFD/HSA and ROCm Toolchain sections and added a Chapter 6 ROCm/KFD Compute Path (HSA_ENABLE_SDMA=1, the gfx-version override, what works / does not, the open compute defect, and an honest reconciliation of the RADV "MEC is dead" finding against ROCm stability).

Gap 4 (updated apu TUI screenshot): the manual carries an ASCII depiction of the apu screen with the new Core Map panel. A fresh image capture still needs a live BC-250 blade running the cores module at 8C/16T.