chore: promote 0.3.0-alpha to 0.3.0-beta for internal testing

Bumps version in pyproject.toml and semantica/__init__.py from 0.3.0-alpha
to 0.3.0-beta, updates PyPI classifier to Development Status 4 - Beta,
and promotes all Unreleased CHANGELOG entries under the [0.3.0-beta] section.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.0-beta] - 2026-03-07
 
 - **Multi-Founder LLM Extraction & Reasoner Inference Fix** (PR #354 by @KaifAhmad1):
   - Fixed `_parse_relation_result` in `methods.py` — unmatched subjects/objects now produce a synthetic `UNKNOWN` entity instead of silently dropping the relation; all LLM-returned co-founders are preserved

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "semantica"
-version = "0.3.0-alpha"
+version = "0.3.0-beta"
 description = "🧠 Semantica - An Open Source Framework for building Semantic Layers and Knowledge Engineering"
 readme = "README.md"
 license = { text = "MIT" }
@@ -15,7 +15,7 @@ maintainers = [{ name = "Hawksight AI", email = "semantica-dev@users.noreply.git
 requires-python = ">=3.8"
 
 classifiers = [
-  "Development Status :: 3 - Alpha",
+  "Development Status :: 4 - Beta",
   "Intended Audience :: Developers",
   "Intended Audience :: Science/Research",
   "License :: OSI Approved :: MIT License",

semantica/__init__.py

@@ -10,7 +10,7 @@ Main exports:
     - Config: Configuration management
 """
 
-__version__ = "0.2.7"
+__version__ = "0.3.0-beta"
 __author__ = "Semantica Contributors"
 __license__ = "MIT"