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/CanaryTokens/BlobListView.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/BlobListView.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import type { BlobRow } from './types';
 import { fmt, fmtBytes } from './helpers';

decnet_web/src/components/CanaryTokens/CreateTokenModal.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/CreateTokenModal.tsx

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

decnet_web/src/components/CanaryTokens/FileDropListView.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/FileDropListView.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 import type { FileDropEntry } from './FileDropModal';
 import { fmt, fmtBytes } from './helpers';

decnet_web/src/components/CanaryTokens/FileDropModal.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/FileDropModal.tsx

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

decnet_web/src/components/CanaryTokens/TokenListView.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/TokenListView.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React, { useMemo } from 'react';
 import { Search } from '../../icons';
 import type { CanaryTokenRow } from '../CanaryTokenDrawer';

decnet_web/src/components/CanaryTokens/UploadModal.test.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { describe, it, expect, vi } from 'vitest';
 import { render, screen } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';

decnet_web/src/components/CanaryTokens/UploadModal.tsx

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

decnet_web/src/components/CanaryTokens/helpers.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import type { ApiError } from '../../utils/api';
 
 /** Normalize an axios error into operator-friendly text, with role

decnet_web/src/components/CanaryTokens/types.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 /** Wire + UI types for the CanaryTokens page surface. */
 
 export interface BlobRow {

decnet_web/src/components/CanaryTokens/ui.tsx

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import React from 'react';
 
 export const INPUT_STYLE: React.CSSProperties = {

decnet_web/src/components/CanaryTokens/useCanaryTokens.test.ts

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

decnet_web/src/components/CanaryTokens/useCanaryTokens.ts

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
 import { useCallback, useEffect, useMemo, useState } from 'react';
 import api from '../../utils/api';
 import type { CanaryTokenRow } from '../CanaryTokenDrawer';