chore(release): 1.3.0

Version sync in every file that carries it: pyproject.toml, __init__.py,
tests/test_smoke.py, README (status heading, its anchor, the wheel command),
uv.lock and a new CHANGELOG section. No tag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.0] - 2026-09-23
+
+### Changed
+- Replace sector-specific example material with generic, fictitious examples. The context sets
+  under `contexts/`, the packaged knowledge bases and the example bundles are all fictitious now;
+  gate figures measured on them are not comparable with those of earlier releases.
+
 ## [1.2.0] - 2026-09-20
 
 The release that opens the run path to callers who are not this framework. Every path through the