chore: repo scaffold — gitignore, dual license (GPLv3 + CC-BY-SA-4.0), README

README.md

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+# DECNET BEHAVE
+
+Behavioral observation spec for adversarial network attribution.
+BEHAVE defines a structured observation envelope (`core`) and two domain registries — shell-session (`BEHAVE-SHELL`) and text/messaging (`BEHAVE-TEXT`) — used to build behavioral signatures over collected operator activity.
+
+## Packages
+
+| Package | Description | Path |
+|---|---|---|
+| `decnet-behave-core` | Shared observation envelope — schema contract used by all registries | [`core/`](core/) |
+| `decnet-behave-shell` | Shell-session behavioral observation registry | [`BEHAVE-SHELL/`](BEHAVE-SHELL/) |
+| `decnet-behave-text` | Text/messaging-domain behavioral observation registry | [`BEHAVE-TEXT/`](BEHAVE-TEXT/) |
+
+## Install
+
+Each package is independently installable. Install `core` first as both registries depend on it.
+
+```bash
+pip install -e core/
+pip install -e BEHAVE-SHELL/
+pip install -e BEHAVE-TEXT/
+```
+
+For development (includes pytest + ruff):
+
+```bash
+pip install -e "core/[dev]"
+pip install -e "BEHAVE-SHELL/[dev]"
+pip install -e "BEHAVE-TEXT/[dev]"
+```
+
+## Test
+
+```bash
+pytest core/
+pytest BEHAVE-SHELL/
+pytest BEHAVE-TEXT/
+```
+
+## Licensing
+
+This repository uses a dual license:
+
+| Content | License |
+|---|---|
+| Code, JSON schemas, tests (`*.py`, `*.json`, `pyproject.toml`) | [GNU GPL v3.0 or later](LICENSE) |
+| Spec prose and attribution recipes (`*.md` files) | [CC-BY-SA-4.0](LICENSE.docs) |
+
+SPDX identifiers are present in individual files.