chore: add CHANGELOG.md for v1.3.0

Author: mehbul

CHANGELOG.md

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+# Changelog
+
+All notable changes to Chopify 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).
+
+## [Unreleased]
+
+## [1.3.0] - 2026-09-06
+
+### Added
+- **Complete-thought clips**: every clip is grown or trimmed to end on a sentence
+  with terminal punctuation, so clips never start or end mid-thought.
+- **Keyword search** (`--search "pricing"`): bypass virality scoring and build
+  clips around transcript sentences containing all your keywords.
+- **Review workflow** (`--clips 1,3,5`): scoring prints a numbered candidate
+  table; render only the rows you pick.
+- **Preview drafts** (`--preview`): render fast 480p cuts (no poster or
+  metadata) to check your picks before the full-quality render.
+- **Dependency pre-flight check**: before any stage, verifies ffmpeg/ffprobe are
+  on PATH, the ffmpeg build can encode H.264 (libx264) and AAC, and required
+  Python packages are installed — each problem reported with a fix hint. Bypass
+  with `--no-preflight`.
+
+### Changed
+- Candidate selection now shares a single window-growth routine
+  (`_grow_window`) between virality scoring and keyword search, both enforcing
+  the complete-thought rule.
+
+[Unreleased]: https://github.com/mehbul/chopify/compare/v1.3.0...HEAD
+[1.3.0]: https://github.com/mehbul/chopify/releases/tag/v1.3.0