chore(release): v0.4.0

Cut a minor release covering the versioncheck overhaul, ~48 default image
refreshes, 13 moved-repo repoints, the polygon-zkevm -> cdk-erigon client
migration, and dropping version tracking for image-less chains. Bumps the
Helm chart to 0.4.0 and backfills the missing 0.3.0 changelog entry.

Context: assembled the changelog from the git log since v0.3.0 and aligned
Chart.yaml (was lagging at 0.2.3). Note CI Actions are currently not
provisioning runners, so the release-image workflow will not fire on the
tag — the container image needs a manual build/push or a billing fix.

Author: tazhate

CHANGELOG.md

@@ -10,6 +10,37 @@ release until the API is promoted to `v1beta1`.
 
 ## [Unreleased]
 
+## [0.4.0] - 2026-06-14
+
+### Added
+
+- `polygon-zkevm` migrated from the archived `zkevm-node` to `cdk-erigon`
+  (Erigon-based client). New `hermez-mainnet` config, image
+  `ghcr.io/0xpolygon/cdk-erigon`, and bumped resource defaults.
+
+### Changed
+
+- `versioncheck` now picks the semver-max stable tag instead of the first
+  stable tag, paginates Docker Hub so the newest release is actually seen,
+  rejects op-stack service-build tags, and talks to Google Artifact
+  Registry without a token (parsing its nested tag shape).
+- Refreshed ~48 default node images to their latest stable tags.
+- Repointed 13 chains whose image repositories had moved or were renamed:
+  morph, dogecoin, kava, sei, dymension, solana, core, metis, taiko,
+  manta-pacific, plasma, boba-eth, hashkey.
+
+### Removed
+
+- Dropped automatic version tracking for chains that publish no public,
+  version-tagged image (cronos, telos, fantom, wemix, shibarium,
+  bittorrent, sonic, zircuit, moca). Their pinned defaults are unchanged.
+
+## [0.3.0] - 2026-05-06
+
+### Changed
+
+- Updated blockchain node default images.
+
 ## [0.2.3] - 2026-04-29
 
 ### Fixed

charts/chainplane/Chart.yaml

@@ -2,8 +2,8 @@ apiVersion: v2
 name: chainplane
 description: A Kubernetes operator for managing blockchain node lifecycle
 type: application
-version: 0.2.3
-appVersion: "v0.2.3"
+version: 0.4.0
+appVersion: "v0.4.0"
 kubeVersion: ">=1.26.0-0"
 home: https://github.com/tazhate/chainplane
 sources: