docs: add changelog and semantic versioning guidance

Author: TemasRE

.github/release.yml

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+changelog:
+  categories:
+    - title: Features
+      labels:
+        - enhancement
+        - feature
+    - title: Fixes
+      labels:
+        - bug
+    - title: Documentation
+      labels:
+        - documentation
+    - title: CI/CD
+      labels:
+        - ci
+    - title: Maintenance
+      labels:
+        - chore
+        - task
+  exclude:
+    labels:
+      - skip-changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented in this file.
+
+The format is based on Keep a Changelog and this project uses semantic versioning.
+
+## [Unreleased]
+
+### Added
+
+- GitHub issue templates, PR template, and CODEOWNERS.
+- CI and release workflows.
+- Build and release helper scripts.
+- Publishing and contribution guides.
+
+## [0.1.0] - 2026-02-22
+
+### Added
+
+- Initial macOS SwiftUI cleaner app.
+- Category-based cleanup planning and execution engine.
+- Terminal-style cleanup output in preview tab.
+- Permanent deletion mode for selected cleanup targets.
+- App icon set and polished UI structure.

docs/VERSIONING.md

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+# Versioning Strategy
+
+This repository follows semantic versioning:
+
+- `MAJOR`: breaking behavior changes
+- `MINOR`: backward-compatible features
+- `PATCH`: backward-compatible fixes
+
+Git tags follow this exact format:
+
+- `vMAJOR.MINOR.PATCH`
+
+Examples:
+
+- `v0.1.0`
+- `v0.2.1`
+- `v1.0.0`
+
+## Release checklist
+
+1. Ensure `main` is green in CI.
+2. Update `CHANGELOG.md`.
+3. Create and push annotated tag.
+4. Verify GitHub release artifact is generated.
+5. Announce release notes.