docs: address CodeRabbit comments on PR #79

- ROADMAP: clarify GitHub OAuth is a v1.2.0 feature, not v1.1.0
- ROADMAP: bump Last Updated metadata to 2026-04-05
- CHANGELOG: add v1.2.0 and v1.1.0 comparison links; fix Unreleased
  link to point to v1.2.0...HEAD

Author: iamvirul

CHANGELOG.md

@@ -406,7 +406,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - PostgreSQL schema-aware queries
 - MySQL foreign key check handling
 
-[Unreleased]: https://github.com/iamvirul/deepdiff-db/compare/v1.0.0...HEAD
+[Unreleased]: https://github.com/iamvirul/deepdiff-db/compare/v1.2.0...HEAD
+[1.2.0]: https://github.com/iamvirul/deepdiff-db/compare/v1.1.0...v1.2.0
+[1.1.0]: https://github.com/iamvirul/deepdiff-db/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/iamvirul/deepdiff-db/compare/v0.9...v1.0.0
 [0.9]: https://github.com/iamvirul/deepdiff-db/compare/v0.8...v0.9
 [0.8]: https://github.com/iamvirul/deepdiff-db/compare/v0.7...v0.8

ROADMAP.md

@@ -43,7 +43,7 @@ We release a new version every **Saturday**. Each release includes one or more f
 - Per-batch memory telemetry at DEBUG log level (`alloc_mb`, `batch`)
 - Oracle Database support — pure Go driver, no Instant Client required
 - Git-like versioning — `version init/commit/log/diff/rollback` with SHA-256 content-addressable commit objects and offline rollback SQL generation
-- **NEW:** GitHub OAuth author verification — device flow auth in `version init`; verified `github:<username>` used automatically in `version commit`
+- **NEW in v1.2.0:** GitHub OAuth author verification — device flow auth in `version init`; verified `github:<username>` used automatically in `version commit`
 
 ---
 
@@ -291,5 +291,5 @@ If you'd like to contribute to any of these features, please:
 
 ---
 
-**Last Updated:** 2026-03-22
+**Last Updated:** 2026-04-05