docs: quick guide, docs README, specifications and NOTICE

NOTICE

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+# NOTICE
+
+OTKO
+Copyright © 2026 Ozan and contributors.
+
+## OTKO license
+
+OTKO's own source code is licensed under the **GNU Affero General Public
+License v3.0** (AGPL-3.0). The full text is in [`LICENSE`](LICENSE). This
+`NOTICE` file does not replace or modify that license; where the two
+disagree, `LICENSE` governs.
+
+OTKO is **not** an MIT-licensed project. Portions of the codebase were
+ported or adapted from an earlier, MIT-licensed prototype called
+`otko-development`, so the original MIT notice is reproduced below as
+required by that license.
+
+## Ported / adapted code: `otko-development`
+
+Portions of OTKO were ported or adapted from the `otko-development`
+project, which is distributed under the MIT License. The MIT
+copyright and permission notice is reproduced verbatim below:
+
+```
+MIT License
+
+Copyright (c) 2026 OTKO contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```
+
+## Runtime dependencies
+
+OTKO depends on third-party software that is not covered by OTKO's
+AGPL-3.0 license. Each component remains under its own license, and its
+license text ships with the corresponding package. The notes below are a
+summary for attribution, not a substitute for those license texts.
+
+- **OpenSees / OpenSeesPy** — the finite-element solver invoked by
+  `otko.services.opensees_runner`. OpenSees is copyright The Regents of
+  the University of California and is distributed under a BSD-style
+  license; the notice is shipped inside the `openseespy` package.
+- **PySide6** — the Qt 6 bindings used by the desktop GUI. PySide6 is
+  available under the GNU Lesser General Public License v3 (LGPLv3) or a
+  commercial license. OTKO links against it dynamically, which keeps the
+  LGPL relinking obligation satisfiable for redistributors.
+- **numpy**, **pydantic**, **h5py**, **pyvista**, **VTK**,
+  **pyqtgraph**, and **imageio** — each is distributed under its own
+  license (for example BSD-3-Clause, MIT, and similar permissive terms).
+  See the license file bundled with each installed package for the exact
+  terms.
+
+When redistributing OTKO, keep `LICENSE`, this `NOTICE`, and the license
+notices of the dependencies above.