diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7bb03cb..f4e5058 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,9 @@ A `### Breaking` section is used in addition to Keep a Changelog's standard sect
 - Push validation now triggers on all branches, not only `main`.
 - Push and PR validation workflows now share a `concurrency` group keyed on the branch name (`github.ref_name` / `github.head_ref`) with `cancel-in-progress: true`; when a push to a PR branch fires both workflows, the second run cancels the first so only one validation executes per commit.
 - Push validation now performs an open-PR branch check via the Gitea API and skips the heavy validation job when the branch already has an open PR, preventing duplicate full pipeline runs.
+- Push validation open-PR detection is now POSIX-shell compatible (no bash-only `pipefail`/array/`[[ ... ]]` usage), fixing failures on runners that execute `run` scripts with `/bin/sh`.
+- PR validation now checks that `coverage.out` exists before invoking `coverage-badge`; when missing, badge upload is skipped with a summary note instead of failing the workflow.
+- PR decoration is now `continue-on-error` to avoid hard-failing validation when the external `decorate-pr` action's internal extractor step is unavailable.
 - README badge link target updated to `actions/runs/latest?workflow=...` format per workflow standards.
 - CI security scanning now uses GitHub Marketplace actions (`securego/gosec` and `golang/govulncheck-action`) instead of manual tool installation, improving reliability and caching.
 - CI setup compatibility fix: gosec scanner now references the correct public action source (`securego/gosec`), resolving action clone failures in Gitea runners.