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/cli/__init__.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """
 DECNET CLI — entry point for all commands.
 

decnet/cli/agent.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import os

decnet/cli/api.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import os

decnet/cli/bus.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/canary.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """``decnet canary`` — HTTP + DNS callback receiver for canary tokens.
 
 Two entry points share this module:

decnet/cli/db.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 from typing import Optional

decnet/cli/deploy.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 from typing import Optional

decnet/cli/forwarder.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import asyncio

decnet/cli/gating.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Role-based CLI gating.
 
 MAINTAINERS: when you add a new Typer command (or add_typer group) that is

decnet/cli/geoip.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """GeoIP CLI — refresh and lookup subcommands (master-only).
 
 Usage::

decnet/cli/init.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """
 `decnet init` — one-shot master-host bootstrap.
 

decnet/cli/inventory.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/lifecycle.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import subprocess  # nosec B404

decnet/cli/listener.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import asyncio

decnet/cli/orchestrator.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 from typing import Optional

decnet/cli/profiler.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/realism.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """``decnet realism ...`` — content-engine maintenance commands.
 
 After stage 5 of the realism migration, this is the only remaining

decnet/cli/reconciler.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/sniffer.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/swarm.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """`decnet swarm ...` — master-side operator commands (HTTP to local swarmctl)."""
 
 from __future__ import annotations

decnet/cli/swarmctl.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import os

decnet/cli/topology.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """MazeNET topology CLI: generate / deploy / teardown / list / show."""
 from __future__ import annotations
 

decnet/cli/ttp.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """``decnet ttp`` — TTP-tagging worker and admin commands.
 
 Two flat commands share this module:

decnet/cli/updater.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import pathlib as _pathlib

decnet/cli/utils.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Shared CLI helpers: console, logger, process management, swarm HTTP client.
 
 Submodules reference these as ``from . import utils`` then ``utils.foo(...)``

decnet/cli/web.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/webhook.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 import typer

decnet/cli/workers.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 from __future__ import annotations
 
 from typing import Optional