[PATCH 19/23] mcp-server: Add GPL-2.0-or-later license headers to all files

Add SPDX license identifiers and copyright notices to ensure GPL
compatibility with the rest of rteval. The MCP server code is part of
rteval and must be licensed under GPL-2.0-or-later to be compatible
with the main project.

Changes:
- Add GPL-2.0-or-later SPDX identifier to all Python files
- Add copyright notice: Copyright 2026 John Kacur <[email protected]>
- Add UTF-8 encoding declaration to all Python files
- Add License section to README.md with GPL boilerplate

All files now follow the same licensing pattern as the rest of rteval,
with proper SPDX identifiers in the header comments.

Assisted-by: Claude:claude-sonnet-4-5
Signed-off-by: John Kacur <[email protected]>
---
 mcp-server/DEPENDENCIES.md               |  8 ++++++++
 mcp-server/README.md                     | 11 +++++++++++
 mcp-server/server.py                     |  7 +++++++
 mcp-server/tests/test_histogram.py       |  7 +++++++
 mcp-server/tests/test_mcp_integration.py |  7 +++++++
 mcp-server/tests/test_new_tools.py       |  7 +++++++
 mcp-server/tests/test_per_cpu_stats.py   |  7 +++++++
 7 files changed, 54 insertions(+)

diff --git a/mcp-server/DEPENDENCIES.md b/mcp-server/DEPENDENCIES.md
index e139bd7df718..d8501916d628 100644
--- a/mcp-server/DEPENDENCIES.md
+++ b/mcp-server/DEPENDENCIES.md
@@ -1,3 +1,11 @@
+<!--
+SPDX-License-Identifier: GPL-2.0-or-later
+
+rteval MCP Server - Dependencies
+
+Copyright 2026 John Kacur <[email protected]>
+-->
+
 # Dependencies
 
 ## Fedora Packages
diff --git a/mcp-server/README.md b/mcp-server/README.md
index 81252964f1eb..6d6a9eb257dd 100644
--- a/mcp-server/README.md
+++ b/mcp-server/README.md
@@ -2,6 +2,17 @@
 
 An MCP (Model Context Protocol) server for querying and analyzing rteval test results.
 
+## License
+
+SPDX-License-Identifier: GPL-2.0-or-later
+
+Copyright 2026 John Kacur <[email protected]>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
 ## Purpose
 
 This MCP server provides tools to:
diff --git a/mcp-server/server.py b/mcp-server/server.py
index 8fbe7836facd..7a4c4f598af1 100755
--- a/mcp-server/server.py
+++ b/mcp-server/server.py
@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+#   rteval MCP Server - tools for analyzing rteval results
+#
+#   Copyright 2026   John Kacur <[email protected]>
+#
 """
 rteval MCP Server
 
diff --git a/mcp-server/tests/test_histogram.py b/mcp-server/tests/test_histogram.py
index a7e47c3cd2d0..917afb1aac93 100644
--- a/mcp-server/tests/test_histogram.py
+++ b/mcp-server/tests/test_histogram.py
@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+#   rteval MCP Server tests - histogram and percentile tools
+#
+#   Copyright 2026   John Kacur <[email protected]>
+#
 """
 Test script for histogram extraction and percentile calculation.
 """
diff --git a/mcp-server/tests/test_mcp_integration.py b/mcp-server/tests/test_mcp_integration.py
index 7f137b81d51b..0b5f2954a16f 100644
--- a/mcp-server/tests/test_mcp_integration.py
+++ b/mcp-server/tests/test_mcp_integration.py
@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+#   rteval MCP Server tests - integration tests
+#
+#   Copyright 2026   John Kacur <[email protected]>
+#
 """Integration tests for rteval MCP server.
 
 Tests the MCP server tools through the actual MCP interface,
diff --git a/mcp-server/tests/test_new_tools.py b/mcp-server/tests/test_new_tools.py
index cc6456960785..a81b23bbffbb 100644
--- a/mcp-server/tests/test_new_tools.py
+++ b/mcp-server/tests/test_new_tools.py
@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+#   rteval MCP Server tests - query/filter tools
+#
+#   Copyright 2026   John Kacur <[email protected]>
+#
 """Test the new query/filter tools."""
 
 import sys
diff --git a/mcp-server/tests/test_per_cpu_stats.py b/mcp-server/tests/test_per_cpu_stats.py
index 673cc89f0b08..6ec07dbf39fe 100644
--- a/mcp-server/tests/test_per_cpu_stats.py
+++ b/mcp-server/tests/test_per_cpu_stats.py
@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+#   rteval MCP Server tests - per-CPU statistics
+#
+#   Copyright 2026   John Kacur <[email protected]>
+#
 """Test the get_per_cpu_stats tool."""
 
 import sys
-- 
2.55.0