chore: clean release docs and workflows

.github/workflows/release-plz.yml

@@ -20,12 +20,6 @@ on:
   push:
     branches: [main]
 
-env:
-  # actions/upload-artifact@v5 and download-artifact@v5 still run on Node
-  # 20. Forcing Node 24 here silences the deprecation notice.
-  # https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/
-  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
-
 permissions:
   contents: read
 
@@ -38,6 +32,9 @@ jobs:
     runs-on: ubuntu-24.04
     permissions:
       contents: write
+    concurrency:
+      group: release-plz-release-${{ github.ref }}
+      cancel-in-progress: false
     steps:
       - name: Checkout
         uses: actions/checkout@v5

.github/workflows/release.yml

@@ -285,20 +285,3 @@ jobs:
         env:
           CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
         run: cargo publish --locked
-
-  announce:
-    needs:
-      - plan
-      - host
-      - publish-crates-io
-    # use "always() && ..." to allow us to wait for all publish jobs while
-    # still allowing individual publish jobs to skip themselves (for prereleases).
-    # "host" however must run to completion, no skipping allowed!
-    if: ${{ always() && needs.host.result == 'success' && (needs.publish-crates-io.result == 'success' || needs.publish-crates-io.result == 'skipped') }}
-    runs-on: "ubuntu-24.04"
-    env:
-      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    steps:
-      - uses: actions/checkout@v5
-        with:
-          submodules: recursive

CONTRIBUTING.md

@@ -66,8 +66,7 @@ tests/                 Black-box integration tests per feature
                        (selectors, regex, context, stdin, multi_file, …).
 
 benches/large_file.rs  Criterion micro-benchmarks for the streaming path.
-docs/                  User docs: README index, USAGE, ARCHITECTURE;
-                       superpowers/ holds optional design session notes.
+docs/                  User docs: README index, USAGE, ARCHITECTURE.
 ```
 
 See [`docs/README.md`](docs/README.md) for the full documentation index and