VGT_SHADER_STAGES_EN=0x2002008: unsupported vertex routing, scheduling or wave-ID state (Wobbly Life PPSA29413) #4329

What

In the tutorial open world, a draw aborts on an unhandled vertex stage configuration:

[videoout] presentation failed: AGC graphics: VGT_SHADER_STAGES_EN=0x2002008: unsupported vertex routing, scheduling or wave-ID state
terminate called after throwing an instance of 'std::runtime_error'
  what():  AGC graphics: VGT_SHADER_STAGES_EN=0x2002008: unsupported vertex routing, scheduling or wave-ID state

Deterministic: 4 of 4 runs stop here (~835 file opens in), played and unplayed alike, making the tutorial unwinnable on current main.

Repro

Wobbly Life (PPSA29413, Unity 2022.3) on Linux (CachyOS), GCC 16.2.1, Intel i5-12400 + NVIDIA RTX 3060 Ti (615.71.09), current main 2ccbd37, includes #419 and #2169, stock build plus relink. Boot the title into the tutorial open world. Bring-up thread: #2211.

Sibling, not duplicate

#3880 is the same throw site with VGT_SHADER_STAGES_EN=0x482030 (GS fast-launch path, Wolverine). Different value, different stage config, different title; dupe if the root cause is shared.

Already in tree, not covering it

• feat(agc): multisampled color and depth targets with CB resolves #419 (standard 8x MSAA targets, merged)
• feat(agc): support uniform custom MSAA sample locations #2169 (custom sample locations, merged; this abort is past it)
• fix(agc): skip prim state preparation for a patch/hull mismatch #2293 (prim-state patch/hull mismatch skip, merged; different check)

AI-assisted: yes