TileOP: explicit-groupM overloads across the TMATMUL family

[VV0003]

Extends the cooperative Local-A/Shared-B explicit-groupM pattern (ADR-0100) from TMATMUL to the full matrix family, mirroring:

• TMATMUL(d, local_a, shared_b, groupM)
• TMATMUL(d, local_a, shared_b, options, groupM)

New overloads

TMATMUL_ACC(d, c, a, b, groupM)
TMATMUL_BIAS(d, a, b, bias, groupM)
TMATMUL_MX(d, a, sa, b, sb, groupM)
TMATMUL_MX_ACC(d, c, a, sa, b, sb, groupM)
TMATMUL_MX_BIAS(d, a, sa, b, sb, bias, groupM)

All share one helper namespace (pto_matmul_groupm_detail) enforcing:

• Local-A/Shared-B only (Shared-A derives group_M from its own descriptor)
• D (and C) valid rows equal the per-PE A shard size (M_per_PE)
• runtime group_M ∈ 1..128 (printf + trap, mirroring the ASL dispatch)

Options overloads (options, groupM) already exist for TMATMUL (from #72) and work through the same emit chain; the ACC/BIAS/MX family's basic (parameter-free) forms get the same capability here.

Pre-existing MX bugs fixed (surfaced by the Shared-scale paths)

1. Basic TMATMUL_MX/MX_ACC/MX_BIAS constrained scale operands to is_tile_data_v, rejecting SharedTile scales the options overloads already accept → relaxed to typename.
2. The Local-A/Shared-B emitters bound a Shared scale with "Tr"(scale.data()) — SharedTile has no data() — and emitted B.IOT for it → now "Sr"(handle()) and B.IOS, matching the options-version convention (PTO_FIXP_MX_SB_SRC).
3. The 5SRC helper mis-ordered B.IOT %[ScaleB], %[Extra] into one binder; now emits B.IOS scale then B.IOT Extra.

Verification (fixture CoopGroupMOverloads)

• TMATMUL_ACC/BIAS with CubeM16 (group_M=64) and CubeM32 (group_M=128): disassembly shows LB0 carrying the runtime group_M (B.DIM reg, 0), N/K immediate-form (C.B.DIMI)
• TMATMUL_MX/MX_ACC/MX_BIAS with Local e4m3 A + Shared B + Shared e8m0 scale: B.IOS S1 scale binder + runtime LB0
• MXScaleVariants / GroupMatmul / SharedMatmul / TMatmulAcc* / PostProcessCombos / HiF4X2MatmulMX / TGEMV* and unittest 40/40 all clean
• TMatmulAllOptions retains 3 pre-existing match errors — identical on the unmodified baseline (verified via stash)

Note: TGEMV family is intentionally excluded — per ADR-0100 it only allows Local operands and has no cooperative group_M.