fix(agc): skip registration-time preparation for unsupported shader types - #1893

Another title that needs this: Rise of the Ronin (PPSA04540).

Setup: Linux, RX 9070 XT (RADV). Base is main 43972e6 + #1836 + #1837 + #2105 + #2153, plus local throwing placeholders for imports the title never calls in these runs.

• Without this PR, the title stops about 3 min 40 s in, while it loads its shaders: AGC driver: unsupported registered shader type.
• With it, the log shows Shader ... has unsupported registered shader type 8; it is not prepared at registration for its type 8 shaders. The title goes on to a later, unrelated stop at about 4 min 40 s (NGS2: system option flags are not implemented).

Tested and written by Claude (AI assistant) on a contributor's machine.

Native Windows run, since no Windows results were posted. Setup: Windows 10 (19045), RTX 3060 Laptop (NVIDIA 616.92), MinGW-w64 GCC 15.2.0 (WinLibs r7), Release. Head 21612855, merged onto main d70b899 in one build with 33 other AGC/shader PRs that had no Windows run.

• This PR's tests pass: agc_driver_prepared_shaders, agc_driver_prepared_shaders_indirect, agc_driver_prepared_shaders_uncached, agc_driver_prepared_shaders_debug, agc_driver_prepared_shaders_debug_failure. None of them reported skipping a case.
• Full ctest in that build: 514 of 515. The one failure is fix(agc): defer a shader whose code does not decode instead of aborting the title #2257's new test, which is registered without the Windows PATH setup.

No title was run.

🤖 Addressed by Claude Code

A third title, with a different type: 007 First Light (PPSA11386 v01.018.000) on Linux (CachyOS, kernel 7.2.9, GCC 16.2.1), RTX 3080 (NVIDIA 615.71.09). Base is main 58706dc (carried in by #2500's branch) plus the PRs that get the title this far: SleglJan#15 to #21, #1964, #2282, #2327, #2347, #2471, #2480, #2500 (the last three closed by the intake pause) and #1184's ResourceTracker.cpp change.

• Without this PR, start-up stops after 654 shader-cache writes with AGC driver: unsupported registered shader type. With it (2161285), 10 of the 581 registered shaders are logged as Shader 0x… has unsupported registered shader type 3; it is not prepared at registration, and start-up goes on to at least 725 shader-cache writes and an unrelated recompiler stop (GetSamplerResource dword 3 is not a valid runtime value; chain: BitReverse32(Immediate)).
• Unlike the type 8 shaders in the description, these type 3 headers carry program registers. APS5_TRACE_SHADER_REGS=all lists sh registers 0x148/0x149, 0x10a/0x10b and 0x100 (twice), plus context registers 0x286, 0x287, 0x2d6 and 0x2db; 0x148/0x149 and 0x10b are what PrepareRegistered reads for type 5. So for type 3 the skip may only defer a failure to the first use of these shaders. Neither run gets far enough to show what happens then.

AI-assisted: yes (Claude Code)