docs: add changelog for v0.1.0 and refresh roadmap

Author: AnonJon

CHANGELOG.md

@@ -0,0 +1,29 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [Unreleased]
+
+## [0.1.0] - 2026-03-08
+
+### Added
+
+- Initial `kdocter` CLI:
+  - `kdocter diagnose cluster`
+  - `kdocter diagnose pod <name>`
+- Namespace controls: `-n/--namespace`, `-A/--all-namespaces`
+- Output formats: `text`, `json`, `sarif`
+- Offline analysis via `--context-file`
+- Analyzer engine, analyzer trait, and registry
+- Built-in analyzers (CrashLoopBackOff, ImagePullBackOff, OOMKilled, Unschedulable, Missing Secret/ConfigMap, Service selector mismatch, Node NotReady, NetworkPolicy-related)
+- Dependency graph layer and key relations (`Deployment -> ReplicaSet -> Pod`, `Ingress -> Service`, `Service -> Pod`, `Pod -> Secret/ConfigMap/PVC/Node`, `PVC -> PV`)
+- Confidence scoring and diagnosis ranking
+
+### Changed
+
+- README roadmap updated to separate completed milestones vs next milestones
+
+### CI / Release
+
+- GitHub Actions CI workflow for build/test
+- Tagged release workflow for publishing binaries