chore: add semantic versioning and automatic changelog generation

- Add cliff.toml config for git-cliff with conventional commit parsing
- Create scripts/release.sh for automated version bumping
- Generate CHANGELOG.md from git history with semver tags (v1.0.0, v1.7.2)
- Release workflow: ./scripts/release.sh {major|minor|patch|VERSION}

cliff.toml

@@ -0,0 +1,45 @@
+[changelog]
+header = """# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).\n
+"""
+body = """
+{% if version %}\
+    ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+{% else %}\
+    ## [Unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | striptags | trim | upper_first }}
+    {% for commit in commits %}
+        - {% if commit.scope %}**{{ commit.scope }}**: {% endif %}\
+            {{ commit.message | split(pat="\n") | first | upper_first }}\
+    {% endfor %}
+{% endfor %}\n
+"""
+trim = true
+footer = ""
+
+[git]
+conventional_commits = true
+filter_unconventional = false
+split_commits = false
+commit_parsers = [
+    { message = "^feat", group = "Added" },
+    { message = "^fix", group = "Fixed" },
+    { message = "^doc", group = "Documentation" },
+    { message = "^perf", group = "Performance" },
+    { message = "^refactor", group = "Changed" },
+    { message = "^style", group = "Styling" },
+    { message = "^test", group = "Testing" },
+    { message = "^chore\\(release\\)", skip = true },
+    { message = "^chore", group = "Miscellaneous" },
+    { message = "^ci", group = "CI/CD" },
+    { body = ".*security", group = "Security" },
+    { message = ".*", group = "Other" },
+]
+filter_commits = false
+tag_pattern = "v[0-9].*"