chore: relicense to AGPL-3.0-or-later and add SPDX headers

Replaces LICENSE (GPLv3 -> AGPLv3) and prepends
`SPDX-License-Identifier: AGPL-3.0-or-later` to every source file
across decnet/, decnet_web/, tests/, scripts/, and tools/.

Rationale: closes the GPLv3 ASP loophole so any party operating a
modified DECNET as a network service must offer their modified
source. Personal copyright (Samuel Paschuan) + inbound=outbound
contributions make a future unilateral relicense infeasible.

- LICENSE: full AGPL-3.0 text (gnu.org/licenses/agpl-3.0.txt)
- COPYRIGHT: project copyright notice
- tools/add_spdx_headers.py: idempotent header injector
  (shebang- and PEP 263-aware)

Touches 1565 source files (.py, .ts, .tsx, .js, .jsx, .css, .sh).
No behavior change; comments only.

decnet_web/src/components/MazeNET/Canvas.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { forwardRef, useCallback, useMemo } from 'react';
 import { RotateCcw, LayoutGrid, ZoomIn, ZoomOut } from '../../icons';
 import NetBox from './NetBox';

decnet_web/src/components/MazeNET/ContextMenu.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useEffect, useRef, useState } from 'react';
 import { ChevronRight } from '../../icons';
 

decnet_web/src/components/MazeNET/Inspector/EdgeInspector.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import { Server, Trash2 } from '../../../icons';
 import type { Edge, MazeNode } from '../types';

decnet_web/src/components/MazeNET/Inspector/Inspector.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * @vitest-environment jsdom
  */

decnet_web/src/components/MazeNET/Inspector/NetInspector.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import { GitMerge, Globe, Plus, Trash2 } from '../../../icons';
 import type { MazeNode, Net } from '../types';

decnet_web/src/components/MazeNET/Inspector/NodeInspector.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useEffect, useRef, useState } from 'react';
 import {
   ArrowLeft, ArrowRight, Plus, Shield, Trash2, X,

decnet_web/src/components/MazeNET/Inspector/ServiceInspector.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import { Shield, Trash2 } from '../../../icons';
 import ServiceConfigForm from '../../ServiceConfigForm';

decnet_web/src/components/MazeNET/Inspector/index.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useMemo } from 'react';
 import { Crosshair, MousePointer2, X } from '../../../icons';
 import type { Edge, MazeNode, Net } from '../types';

decnet_web/src/components/MazeNET/Inspector/types.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 export type Selection =
   | { type: 'net'; id: string }
   | { type: 'node'; id: string }

decnet_web/src/components/MazeNET/MazeNET.css

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: AGPL-3.0-or-later */
 /* ── MazeNET canvas ─────────────────────────── */
 
 body.maze-fullscreen .sidebar,

decnet_web/src/components/MazeNET/MazeNET.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useCallback, useEffect, useRef, useState } from 'react';
 import { useSearchParams, useNavigate } from 'react-router-dom';
 import {

decnet_web/src/components/MazeNET/NetBox.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import { Globe, GitMerge, ShieldAlert } from '../../icons';
 import type { Net } from './types';

decnet_web/src/components/MazeNET/NodeCard.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import {
   Server, Monitor, Shield, Database, Cpu, Globe, Users, HardDrive, Eye,

decnet_web/src/components/MazeNET/Palette.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import { GitMerge, ShieldAlert, Server, Monitor, Shield, Database, Cpu, Globe,
          Terminal, Lock, Folder, HardDrive, Users, KeyRound,

decnet_web/src/components/MazeNET/data.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 export interface Archetype {
   slug: string;
   name: string;

decnet_web/src/components/MazeNET/types.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 export type NetKind = 'internet' | 'subnet' | 'dmz';
 
 export interface Net {

decnet_web/src/components/MazeNET/useFullscreenMode.test.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * @vitest-environment jsdom
  */

decnet_web/src/components/MazeNET/useFullscreenMode.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useEffect, useState } from 'react';
 
 const BODY_CLASS = 'maze-fullscreen';

decnet_web/src/components/MazeNET/useMazeApi.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useCallback, useMemo } from 'react';
 import api from '../../utils/api';
 import { ARCHETYPES as DEFAULT_ARCHETYPES, DEFAULT_SERVICES } from './data';

decnet_web/src/components/MazeNET/useMazeContextMenu.test.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * @vitest-environment jsdom
  */

decnet_web/src/components/MazeNET/useMazeContextMenu.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useState } from 'react';
 import {
   Copy, Eye, GitMerge, Plus, Server, ShieldAlert, Trash2, Zap,

decnet_web/src/components/MazeNET/useMazeInteraction.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useCallback, useEffect, useRef, useState } from 'react';
 import type { Net, MazeNode } from './types';
 

decnet_web/src/components/MazeNET/useMazeLayoutStore.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useCallback, useEffect, useRef } from 'react';
 import type { Net, MazeNode } from './types';
 

decnet_web/src/components/MazeNET/useTopologyData.test.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * @vitest-environment jsdom
  */

decnet_web/src/components/MazeNET/useTopologyData.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useCallback, useEffect, useState } from 'react';
 import type { ApiError } from '../../utils/api';
 import type { Net, MazeNode, Edge } from './types';

decnet_web/src/components/MazeNET/useTopologyEditor.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * Status-aware topology editor — wraps {@link useMazeApi} so the MazeNET
  * editor can call one set of primitives regardless of whether the

decnet_web/src/components/MazeNET/useTopologyStream.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /**
  * Topology event stream — opens an SSE connection to
  * `/topologies/{id}/events` and dispatches typed events to the caller.