Add covenant SPDX headers to every remaining unmarked source file

.github/workflows/ci.yml

@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+# Licensing: see LICENSE in the repository root.
+
 name: CI
 on:
   push:

firmware/build.zig

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 // Targets Zig 0.13.x. Build: `zig build` -> zig-out/bin/intent-v.elf
 const std = @import("std");
 

firmware/src/ccu.zig

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 //! Driver for the Conscious Coherence Unit (a gated 32-bit multiplier with an
 //! idle-cycle counter). Register layout must match rtl/.../CcuMmio.scala.
 const std = @import("std");

firmware/src/main.zig

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 const ccu = @import("ccu.zig");
 
 export fn _start() linksection(".text.init") callconv(.Naked) noreturn {

rtl/src/main/scala/intentv/CcuMmio.scala

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 package intentv
 
 import chisel3._

rtl/src/main/scala/intentv/IntentNexus.scala

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 package intentv
 
 import chisel3._

rtl/src/test/scala/intentv/IntentNexusSpec.scala

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: LicenseRef-Sovereign-Leviathan-SL-AGPL3-001
+// Licensing: see LICENSE in the repository root.
+
 package intentv
 
 import chisel3._