spdx: add BSD-3-Clause identifiers to userspace/tools/scripts sources

Sweep of the 155 tracked C/Python/shell files under userspace/ (excluding
the MIT-licensed vendored userspace/extern/), tools/ and scripts/ that had
no per-file license identifier. Each gains the minimal two-line header in
the area's existing form: 'SPDX-License-Identifier: BSD-3-Clause' plus
'Copyright (c) 2026 Open-IOV contributors'; shebang and coding lines stay
first. No other content touched. kernel/** is deliberately out of scope
(recorded as a follow-up in CODESTD-REPORT-2026-10-08.md): its SPDX
coverage and MODULE_LICENSE normalization need their own GPL-2.0 pass.

8 files changed, 16 insertions, 0 deletions

diff --git a/tools/rmtool/src/engine.c b/tools/rmtool/src/engine.c
index c247e47..283856c 100644
--- a/tools/rmtool/src/engine.c
+++ b/tools/rmtool/src/engine.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* engine.c - rmtool engine list/info via read-only GPU/engine controls. */
 #include <getopt.h>
 #include <stdio.h>
diff --git a/tools/rmtool/src/gpu.c b/tools/rmtool/src/gpu.c
index ff9b26c..7db1353 100644
--- a/tools/rmtool/src/gpu.c
+++ b/tools/rmtool/src/gpu.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* gpu.c - rmtool gpu list/topology/info: enumeration and identity queries. */
 #include <getopt.h>
 #include <stdio.h>
diff --git a/tools/rmtool/src/main.c b/tools/rmtool/src/main.c
index 4e4b440..79a34bb 100644
--- a/tools/rmtool/src/main.c
+++ b/tools/rmtool/src/main.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* main.c - rmtool entry point: command dispatch and global help/version.
  *
  * rmtool is a read-only host RM oracle for the Open-IOV accuracy loop. It
diff --git a/tools/rmtool/src/mem.c b/tools/rmtool/src/mem.c
index a85bd70..52a3e5a 100644
--- a/tools/rmtool/src/mem.c
+++ b/tools/rmtool/src/mem.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* mem.c - rmtool mem stats: read-only FB/heap/BAR1 information.
  *
  * Allocation, mapping, pinning and arbitrary-handle inspection are
diff --git a/tools/rmtool/src/nv2080.c b/tools/rmtool/src/nv2080.c
index 5dd808e..0cf1cf1 100644
--- a/tools/rmtool/src/nv2080.c
+++ b/tools/rmtool/src/nv2080.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* nv2080.c - rmtool nv2080 class list / method call and sample.
  *
  * The generic control entry point is restricted to a read-only allowlist so
diff --git a/tools/rmtool/src/output.c b/tools/rmtool/src/output.c
index 6de5d02..289256c 100644
--- a/tools/rmtool/src/output.c
+++ b/tools/rmtool/src/output.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* output.c - table/JSON/CSV formatting helpers shared by rmtool commands. */
 #include <ctype.h>
 #include <stdio.h>
diff --git a/tools/rmtool/src/query.c b/tools/rmtool/src/query.c
index c9a7460..37cf3f8 100644
--- a/tools/rmtool/src/query.c
+++ b/tools/rmtool/src/query.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* query.c - shared read-only RM queries used by rmtool and rmtop. */
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/tools/rmtool/src/rm_api.c b/tools/rmtool/src/rm_api.c
index 17fb48b..fd459cd 100644
--- a/tools/rmtool/src/rm_api.c
+++ b/tools/rmtool/src/rm_api.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/* Copyright (c) 2026 Open-IOV contributors */
 /* rm_api.c - RM ioctl client, GPU discovery and control plumbing.
  *
  * The ioctl ladder (root -> device -> subdevice) and NV_ESC_RM_CONTROL