feat: add AI-assisted changelog generation (#21743)

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: Emma Jamieson-Hoare <emmajam@users.noreply.github.com>
Co-authored-by: Emma Jamieson-Hoare <ejamieson19@gmail.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.changelog/config.toml

@@ -0,0 +1,20 @@
+# Changelogs configuration for reth
+# https://github.com/wevm/changelogs
+
+# How to bump packages that depend on changed packages
+dependent_bump = "patch"
+
+[changelog]
+# Generate per-crate changelogs (vs single root changelog)
+format = "per-crate"
+
+# Fixed groups: all always share the same version
+# reth binaries share version
+[[fixed]]
+members = ["reth", "op-reth"]
+
+# Packages to ignore (internal/test-only crates)
+ignore = [
+    "reth-testing-utils",
+    "reth-bench",
+]

.changelog/shy-tigers-dry.md

@@ -0,0 +1,6 @@
+---
+reth: patch
+op-reth: patch
+---
+
+Added automated changelog generation infrastructure using wevm/changelogs-rs with Claude Code integration. Configured per-crate changelog format with fixed version groups for reth binaries and exclusions for internal test utilities.

.github/workflows/changelog.yml

@@ -0,0 +1,22 @@
+name: Changelog
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref }}
+      - run: npm install -g @anthropic-ai/claude-code
+      - uses: wevm/changelogs-rs/gen@master
+        with:
+          ai: 'claude -p'
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}