Improve particle command interpreter matching

[g-guthrie]

What changed

• recover post-increment bytecode reads across particle commands
• align command operand width and pointer walks with the original interpreter
• improve size, rotation, aim, random-pose, and velocity-normalization code generation
• preserve the size-interpolation count cursor through variable-width operands
• preserve decoded velocity-scale and trail values across particle writes
• split big-endian spawn indices to recover the original instruction scheduling
• separate per-channel color-random lifetimes to recover the original FPR allocation
• lower the aim-distance square root in place to match the original refinement sequence
• recover tornado-physics constant loads and register allocation
• reuse the translation unit existing volatile zero constant
• align repeated JObj attachment loads and translation updates

Why

hsd_8039930C is a 15,264-byte particle command interpreter and one of the largest unmatched functions in the project. The remaining differences are primarily expression ordering, pointer-update shapes, constant lifetimes, and register allocation rather than behavioral gaps.

These source-equivalent changes preserve particle behavior while moving the generated PowerPC code closer to the original. The local exact-compiler comparison improves from 93.83255% on the base revision to 96.82888%. The current generated function is 15,260 bytes, four bytes short of the target, while the candidate .sdata2 section matches the target 96-byte size. Authoritative PR CI reports 492 additional matched bytes and improves hsd_8039930C from 94.44% to 97.67%.

Validation

• exact MWCC 1.2.5n translation-unit compile
• function extraction and objdiff comparison
• clang-format --dry-run --Werror src/sysdolphin/baselib/particle.c
• python3 tools/check/main.py --quiet src/sysdolphin/baselib/particle.c
• git diff --check origin/master...HEAD

The full local Ninja build requires orig/GALE01/sys/main.dol, which is not present in this checkout. The authoritative link, test, and decomp.dev results are expected from the PR checks.

[decomp-dev]

Report for GALE01 (e0c83a9 - 7097580)

📈 2 improvements in unmatched items

Unit	Item	Bytes	Before	After
main/sysdolphin/baselib/particle	hsd_8039930C	+492	94.44%	97.67%
main/sysdolphin/baselib/particle	extabindex	0	97.44%	98.08%