Add CHANGELOG for v1.0.0

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

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.0.0] - 2026-02-20
+
+### Added
+
+- **30 research skills** covering the full academic paper lifecycle:
+  - Phase 0: `deep-research`, `literature-search`, `literature-review`, `idea-generation`, `novelty-assessment`, `research-planning`
+  - Phase 1: `atomic-decomposition`, `algorithm-design`, `math-reasoning`, `symbolic-equation`
+  - Phase 2: `experiment-design`, `experiment-code`, `code-debugging`, `data-analysis`
+  - Phase 3: `paper-writing-section`, `related-work-writing`, `survey-generation`, `paper-to-code`
+  - Phase 4: `figure-generation`, `table-generation`, `citation-management`, `backward-traceability`
+  - Phase 5: `latex-formatting`, `paper-compilation`, `excalidraw-skill`
+  - Phase 6: `self-review`, `paper-revision`, `rebuttal-writing`, `slide-generation`, `paper-assembly`
+- **20 Python scripts** with CLI interfaces (argparse + `--help`)
+- **Slash command**: `/research <topic>` for deep literature reviews
+- **Installer** (`install.sh`) with dependency checking and script verification
+- **Design specifications** (`SKILLS_DESIGN.md`) extracted from 17 GitHub repos
+- **Implementation checklist** (`SKILLS_IMPLEMENTED.md`)