ci: add Repo Assist agentic workflow and dependabot (#53)

Adapt GitHub Agentic Workflows repo-assist from Fable.Python to the
Erlang/OTP binding context: labels, paths under src/otp and src/cowboy,
Emit/Erase/ImportAll patterns, and references to CLAUDE.md /
BINDINGS-GUIDE.md. Also add a minimal dependabot config for NuGet and
GitHub Actions updates.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dbrattli

.gitattributes

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+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

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+{
+  "entries": {
+    "actions/github-script@v8": {
+      "repo": "actions/github-script",
+      "version": "v8",
+      "sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
+    },
+    "actions/github-script@v9": {
+      "repo": "actions/github-script",
+      "version": "v9",
+      "sha": "373c709c69115d41ff229c7e5df9f8788daa9553"
+    },
+    "github/gh-aw-actions/setup@v0.68.3": {
+      "repo": "github/gh-aw-actions/setup",
+      "version": "v0.68.3",
+      "sha": "ba90f2186d7ad780ec640f364005fa24e797b360"
+    }
+  }
+}

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore"
+  - package-ecosystem: "nuget" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: "chore"