Fix Zenodo license metadata and cut the 0.1.0 changelog entry

.zenodo.json declared BSD-3-Clause since it was added, contradicting
LICENSE, CITATION.cff and pyproject.toml, which have always said MIT
(confirmed by the commit that added the file: "the software is MIT,
unchanged from this repository's public release"). Corrects the
metadata and turns the changelog's Unreleased section into a dated
0.1.0 entry ahead of the first tagged release.

Author: bleymambwe

.zenodo.json

@@ -18,7 +18,7 @@
   "access_right": "open",
   "upload_type": "software",
   "language": "eng",
-  "license": "bsd-3-clause",
+  "license": "MIT",
   "keywords": [
     "permutation optimization",
     "fitness landscape",

CHANGELOG.md

@@ -5,6 +5,8 @@ All notable changes to PRISM will be documented here. The project follows
 
 ## [Unreleased]
 
+## [0.1.0] - 2026-08-22
+
 ### Added
 
 - Installable `prism-search` Python package.
@@ -16,7 +18,12 @@ All notable changes to PRISM will be documented here. The project follows
 
 ### Changed
 
-- Adopted the OSI-approved BSD 3-Clause license for software.
 - Retained `prism-research/core/prism.py` as a compatibility import for the
   original experiment scripts.
 
+### Fixed
+
+- `.zenodo.json` incorrectly declared BSD-3-Clause. The software has always
+  been MIT (see `LICENSE`, `CITATION.cff`, `pyproject.toml`); corrected the
+  metadata to match.
+