Merge pull request #1912 from CEED/jeremy/copyright

minor - update copyright to 2026

minor - update copyright to 2026

Merge pull request #1786 from CEED/jeremy/copy-headers

minor - upate copyright to 2025

minor - upate copyright to 2025

Merge pull request #1609 from CEED/jrwrigh/fix_riemann_solvers

fluids: Fix Riemann solvers *_fwd mode functions

refactor(fluids): Rename norm -> normal in freestream

Also remove comment references to potential energy, which is no longer
included in the total energy definition.

fix(fluids): Correct Riemann HLL *_fwd functions

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all sin

Drop JiT Guards in Most QF Source (#1540)

* backend - use pragma once

* gallery - drop source header guards

* ex - drop some qfunction source header guards

* fluids - drop guards on all singly included headers

* jit - drop most guards on backend JiT files

* sycl - drop extra header guards

* jit - enable #pragma once for QF source

* fluids - use #pragma once for util/helper qf source

* test - check different multiple includes

* fluids - fix odd include

* jit - update interface for building JiT string from multiple files

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Merge pull request #1537 from CEED/jeremy/pragma-once

Use #pragma once for non-JiT headers

minor - update copyright headers

Merge pull request #1443 from CEED/jrwrigh/riemann_slip

fluids: Change slip boundary condition formulation

fluids: Implement bc_slip

This is a weak version of slip boundary condition based on a Riemann
solve