diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
new file mode 100644
index 0000000..8d9ae45
--- /dev/null
+++ b/.github/workflows/changelog.yml
@@ -0,0 +1,23 @@
+name: Changelog
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  changelog:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Validate git-cliff changelog generation
+        uses: orhun/git-cliff-action@v4
+        with:
+          config: cliff.toml
+          args: --unreleased --verbose
+        env:
+          OUTPUT: /tmp/changelog-preview.md
diff --git a/.github/workflows/commitlint.yml b/.github/workflows/commitlint.yml
index 3202dc7..9d0fd4b 100644
--- a/.github/workflows/commitlint.yml
+++ b/.github/workflows/commitlint.yml
@@ -3,7 +3,7 @@ name: Lint Commit Messages
 on:
   pull_request:
   push:
-    branches: [main, master]
+    branches: [main]
 
 jobs:
   commitlint:
diff --git a/AGENTS.md b/AGENTS.md
index 237414e..82b7c05 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -22,17 +22,12 @@ validated, and aligned with this gem's public API.
 - Before finishing release-harness changes, run the focused release tests and
   a `git-cliff` smoke check.
 
-## Commit Messages
+## Git Standards
 
-- Use Conventional Commits: `feat`, `fix`, `docs`, `test`, `refactor`, or
-  `chore`.
-- Keep the subject imperative, specific, and under 72 characters.
-- Leave a blank line between the subject and body.
-- Write one coherent reason per commit; split unrelated work first.
-- Use the body when the reasoning matters. Explain why the change exists,
-  what approach was taken, and what constraints or side effects matter.
-- Wrap body lines at 72 characters so commit hooks and terminal tools stay
-  readable.
-- Avoid vague subjects such as `misc fixes`, `updates`, or `cleanup` unless
-  the cleanup is the actual scoped purpose.
-- Mention verification in the body when it materially helps future readers.
+- Use `main` as the canonical integration branch.
+- Never commit directly to `main` or `master`.
+- Use branches for all work.
+- Use Conventional Commits with `What:`, `Why:`, and `Where:` in the body.
+- Keep the subject specific and under 72 characters, with one blank line before
+  the body.
+- Follow the `git-standards` skill for the full validation checklist.
diff --git a/Rakefile b/Rakefile
index 47ad012..5a96389 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "bundler/setup"
+
 require "bundler/gem_tasks"
 require "rake/testtask"
 require "standard/rake"
@@ -172,7 +174,7 @@ namespace :release do
     tag = release_tag(version)
 
     sh "git add CHANGELOG.md lib/indexmap/version.rb"
-    sh %(git commit -m "chore(release): prepare v#{version}")
+    sh %(LEFTHOOK=0 git commit -m "chore(release): prepare v#{version}")
     sh %(git tag -a #{tag} -m "Release #{tag}")
     sh "git push origin #{branch}"
     sh "git push origin #{tag}"
diff --git a/docs/search-engine-ping.md b/docs/search-engine-ping.md
index cdb5c2f..8833959 100644
--- a/docs/search-engine-ping.md
+++ b/docs/search-engine-ping.md
@@ -25,6 +25,21 @@ such as `https://example.com/sitemap.xml` to a verified Search Console
 property. It does not submit arbitrary page URLs to Google for immediate
 indexing.
 
+Current Google API contract:
+
+- API: Search Console Sitemaps API
+- Method: `PUT https://www.googleapis.com/webmasters/v3/sites/{siteUrl}/sitemaps/{feedpath}`
+- OAuth scope: `https://www.googleapis.com/auth/webmasters`
+- Request body: empty
+- Success response body: empty
+
+The Google Indexing API is a separate page-level API at
+`POST https://indexing.googleapis.com/v3/urlNotifications:publish` with the
+`https://www.googleapis.com/auth/indexing` scope. Google documents that API for
+JobPosting pages and livestreaming events with `BroadcastEvent` structured data,
+not for general sitemap submission. `indexmap` therefore uses the Search Console
+Sitemaps API for Google.
+
 ### Create The Google Credentials
 
 1. Open or create a Google Cloud project for the site.
@@ -200,6 +215,9 @@ same key that `indexmap` is submitting.
 ## References
 
 - [Google Search Console Sitemaps API](https://developers.google.com/webmaster-tools/v1/sitemaps/submit)
+- [Google Search Console API reference](https://developers.google.com/webmaster-tools/v1/api_reference_index)
+- [Google Indexing API urlNotifications reference](https://developers.google.com/search/apis/indexing-api/v3/reference/indexing/rest/v3/urlNotifications/)
+- [Google Indexing API usage limits](https://developers.google.com/search/apis/indexing-api/v3/using-api)
 - [Google Cloud service account keys](https://cloud.google.com/iam/docs/keys-create-delete)
 - [Search Console users and permissions](https://support.google.com/webmasters/answer/7687615)
 - [IndexNow protocol documentation](https://www.indexnow.org/documentation)
diff --git a/lefthook.yml b/lefthook.yml
index 013dd7f..b78cc40 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -4,3 +4,13 @@ commit-msg:
       run: bundle exec commitlint --message {1}
     - name: standard
       run: bundle exec rake standard
+
+pre-commit:
+  jobs:
+    - name: protect-main-master
+      run: |
+        branch=$(git branch --show-current)
+        if [ "$branch" = "master" ] || [ "$branch" = "main" ]; then
+          echo "❌ Direct commits to '$branch' are not allowed. Use a feature branch."
+          exit 1
+        fi
diff --git a/lib/indexmap/creator.rb b/lib/indexmap/creator.rb
index f578125..a33d9cc 100644
--- a/lib/indexmap/creator.rb
+++ b/lib/indexmap/creator.rb
@@ -4,7 +4,7 @@
 
 module Indexmap
   class Creator
-    ValidationConfiguration = Struct.new(:base_url, :index_filename, :storage, keyword_init: true)
+    ValidationConfiguration = Struct.new(:base_url, :index_filename, :storage)
 
     def initialize(output:)
       @output = output
diff --git a/lib/indexmap/entry.rb b/lib/indexmap/entry.rb
index 7e548d0..525945b 100644
--- a/lib/indexmap/entry.rb
+++ b/lib/indexmap/entry.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Indexmap
-  Entry = Struct.new(:loc, :lastmod, keyword_init: true)
+  Entry = Struct.new(:loc, :lastmod)
 end
diff --git a/lib/indexmap/parser.rb b/lib/indexmap/parser.rb
index 0a9a24c..3876f53 100644
--- a/lib/indexmap/parser.rb
+++ b/lib/indexmap/parser.rb
@@ -6,7 +6,7 @@
 
 module Indexmap
   class Parser
-    Entry = Struct.new(:loc, :lastmod, :source_sitemap, keyword_init: true)
+    Entry = Struct.new(:loc, :lastmod, :source_sitemap)
 
     def initialize(source: nil, rebase_remote_children: false, index_filename: Indexmap.configuration.index_filename, storage: Indexmap.configuration.storage)
       @source = (source || index_filename).to_s
diff --git a/lib/indexmap/section.rb b/lib/indexmap/section.rb
index 01d8dc7..b86dbbf 100644
--- a/lib/indexmap/section.rb
+++ b/lib/indexmap/section.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Indexmap
-  Section = Struct.new(:filename, :entries, keyword_init: true)
+  Section = Struct.new(:filename, :entries)
 end
diff --git a/lib/indexmap/storage/file.rb b/lib/indexmap/storage/file.rb
index c6b80ef..373bc91 100644
--- a/lib/indexmap/storage/file.rb
+++ b/lib/indexmap/storage/file.rb
@@ -2,7 +2,7 @@
 
 module Indexmap
   module Storage
-    File = Struct.new(:filename, :body, :content_type, keyword_init: true) do
+    File = Struct.new(:filename, :body, :content_type) do
       def basename
         ::File.basename(filename)
       end