chore: RSR compliance — add .editorconfig, fix SPDX headers (PMPL -> MPL-2.0 for Julia)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.editorconfig

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: MPL-2.0
+# (PMPL-1.0-or-later preferred; MPL-2.0 required for EditorConfig ecosystem)
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{jl,rs,zig,idr}]
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[*.md]
+trim_trailing_whitespace = false
+

src/AcceleratorGate.jl

@@ -1,4 +1,5 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
+# (PMPL-1.0-or-later preferred; MPL-2.0 required for Julia ecosystem)
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # AcceleratorGate.jl — Shared coprocessor dispatch infrastructure

test/runtests.jl

@@ -1,4 +1,5 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
+# (PMPL-1.0-or-later preferred; MPL-2.0 required for Julia ecosystem)
 using Test
 using AcceleratorGate