Exclude changelog commits from release notes

Filter out "Update CHANGELOG" commits from both the CHANGELOG.md
generation and the GitHub Release notes so they don't appear as
duplicate entries.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bricef

.github/workflows/ci.yml

@@ -86,7 +86,7 @@ jobs:
           PREV=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || git rev-list --max-parents=0 HEAD)
           echo "## What's Changed" > release-notes.md
           echo "" >> release-notes.md
-          git log --pretty=format:"- %s" "${PREV}..HEAD" --no-merges >> release-notes.md
+          git log --pretty=format:"- %s" "${PREV}..HEAD" --no-merges --grep="^Update CHANGELOG" --invert-grep >> release-notes.md
           echo "" >> release-notes.md
           echo "" >> release-notes.md
           echo "**Docker:** \`docker pull ${{ secrets.DOCKERHUB_USERNAME }}/taskflow:${{ github.ref_name }}\`" >> release-notes.md

justfile

@@ -134,18 +134,19 @@ release tag:
         exit 1
     fi
 
-    # Generate changelog entry.
+    # Generate changelog entry from commits since the last tag,
+    # excluding previous changelog commits.
     PREV=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
     DATE=$(date +%Y-%m-%d)
     ENTRY="## {{tag}} — ${DATE}"$'\n\n'
     if [ -n "$PREV" ]; then
-        ENTRY+=$(git log --pretty=format:"- %s" "${PREV}..HEAD" --no-merges)
+        ENTRY+=$(git log --pretty=format:"- %s" "${PREV}..HEAD" --no-merges --grep="^Update CHANGELOG" --invert-grep)
     else
-        ENTRY+=$(git log --pretty=format:"- %s" --no-merges)
+        ENTRY+=$(git log --pretty=format:"- %s" --no-merges --grep="^Update CHANGELOG" --invert-grep)
     fi
     ENTRY+=$'\n'
 
-    # Prepend to CHANGELOG.md (after the header line).
+    # Prepend to CHANGELOG.md (after the header).
     HEADER=$(head -3 CHANGELOG.md)
     BODY=$(tail -n +4 CHANGELOG.md)
     printf '%s\n\n%s\n%s' "$HEADER" "$ENTRY" "$BODY" > CHANGELOG.md