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/realism/__init__.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Realism library — synthetic content + scheduling primitives.
 
 A shared, importable library that produces *plausible* artifacts (file

decnet/realism/bodies.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Per-content-class body generators (deterministic templates).
 
 Stage 3 of the realism migration ships deterministic per-class

decnet/realism/diurnal.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Work-hours gating and backdated mtime sampling.
 
 The current orchestrator stamps every planted file at wall-clock-now,

decnet/realism/llm/__init__.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """LLM backend for the realism library.
 
 Pluggable per the provider-subpackages convention (mirrors

decnet/realism/llm/base.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Backend protocol shared by every LLM transport.
 
 Deliberately narrow: realism consumers need one async ``generate``

decnet/realism/llm/circuit.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Process-local circuit breaker for LLM calls.
 
 Per-call timeouts (``asyncio.wait_for(llm.generate, timeout=...)``)

decnet/realism/llm/config.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """DB-backed LLM provider configuration for the realism subsystem.
 
 The module holds a process-level cached backend that callers obtain via

decnet/realism/llm/factory.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Backend dispatch.
 
 Reads ``DECNET_REALISM_LLM`` to pick a concrete :class:`LLMBackend`.

decnet/realism/llm/impl/__init__.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Concrete LLM-backend implementations.
 
 Importers go through :func:`decnet.realism.llm.get_llm`, not these

decnet/realism/llm/impl/fake.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """In-process fake backend for tests.
 
 Returns a canned string so the driver path can be exercised without an

decnet/realism/llm/impl/ollama.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Ollama backend — subprocess (local) or HTTP (remote).
 
 **Subprocess mode** (default, ``base_url=None``)

decnet/realism/naming.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Per-content-class filename generators.
 
 The pre-realism orchestrator emitted ``notes-1777315854.txt``

decnet/realism/personas.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Persona schema for realism content generation.
 
 Stored as a JSON list on :attr:`Topology.email_personas`.  Each persona

decnet/realism/personas_pool.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Global persona pool — non-topology deckies.
 
 DECNET runs in three deployment shapes that emit running deckies:

decnet/realism/planner.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Realism planner — picks the next ``(decky, persona, class, action)`` tuple.
 
 Stage 3: returns ``create``-only plans (the edit branch lands in

decnet/realism/prompts/__init__.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Prompt builders for LLM-enriched content.
 
 * :mod:`decnet.realism.prompts.email` — corporate-email body builder.

decnet/realism/prompts/_style.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Shared stylometric guards for LLM-bound prompts.
 
 Lifted from the original ``orchestrator.emailgen.prompt`` em-dash

decnet/realism/prompts/email.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Prompt builder for the email content class.
 
 The LLM gets a tightly-scoped instruction and a small handful of

decnet/realism/prompts/filebody.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Class-conditioned prompt builder for user-class file bodies.
 
 Stage 6 of the realism migration.  Only user-classes (``note``,

decnet/realism/taxonomy.py

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """Content classes and the :class:`Plan` dataclass.
 
 The planner emits :class:`Plan` instances; drivers consume them.  Every