quill: add changelog draft for v1.0.0

wizard-work/quill/changelog_draft.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+This format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [1.0.0] - 2026-10-25
+
+### Added
+- Initial public release.
+- Core authentication module with OAuth2 support.
+- REST API endpoints for user management.
+- CLI tool for batch operations.
+
+### Changed
+- Updated dependency versions for security patches.
+- Improved error handling in the data pipeline.
+
+### Deprecated
+- Legacy v0 API endpoints (to be removed in v2.0.0).
+
+### Removed
+- Deprecated configuration flags from v0.9.0.
+
+### Fixed
+- Login redirect loop when session expires.
+- Memory leak in long-running worker processes.
+
+### Security
+- Patched SQL injection vulnerability in search endpoint.
+- Enforced TLS 1.3 minimum for all outbound connections.