Added code simplification workflows for GH (#26419)

## Description

[GitHub Agentic Workflows (GH
AW)](https://github.github.com/gh-aw/introduction/overview/) are AI
powered workflows that leverage tools available in GitHub to create
automated workflows. This PR is a POC of sorts where I wish to test the
GH AW workflows for [code
simplication](https://github.github.com/gh-aw/blog/2026-01-13-meet-the-workflows-continuous-simplicity/).

These two workflows do the following:

1) Code simpification: The first workflow looks at PRs over the past 24
hours and creates PRs to "simplify" code. The only available
`safe_output` for this flow is PR generation (if the model decides
simplification is needed).
2) Code de-dupe: The second workflows looks at existing code and PRs to
de-dupe code across the repo. If a de-dupe oppurtunity exists, the model
creates an issue in the Microsoft/FluidFramework repo.

**These flows are currently for testing and DO NOT have any intrusive
elevated permissions. They only have the least privilege to perform the
needed tasks.**

## Breaking Changes

There are no breaking changes.

## Reviewer Guidance

Happy to get reviews on any changes to prompts, validation flows etc.

Author: dhr-verma

.gitattributes

@@ -20,3 +20,5 @@ fence.json                   linguist-language=JSON5
 
 # Hide docs from GitHub's language detection
 /docs/**                     linguist-documentation
+
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,14 @@
+{
+	"entries": {
+		"actions/github-script@v8": {
+			"repo": "actions/github-script",
+			"version": "v8",
+			"sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
+		},
+		"github/gh-aw/actions/setup@v0.42.17": {
+			"repo": "github/gh-aw/actions/setup",
+			"version": "v0.42.17",
+			"sha": "7a970851c1090295e55a16e549c61ba1ce227f16"
+		}
+	}
+}

.github/aw/imports/.gitattributes

@@ -0,0 +1,79 @@
+#
+#    ___                   _   _      
+#   / _ \                 | | (_)     
+#  | |_| | __ _  ___ _ __ | |_ _  ___ 
+#  |  _  |/ _` |/ _ \ '_ \| __| |/ __|
+#  | | | | (_| |  __/ | | | |_| | (__ 
+#  \_| |_/\__, |\___|_| |_|\__|_|\___|
+#          __/ |
+#  _    _ |___/ 
+# | |  | |                / _| |
+# | |  | | ___ _ __ _  __| |_| | _____      ____
+# | |/\| |/ _ \ '__| |/ /|  _| |/ _ \ \ /\ / / ___|
+# \  /\  / (_) | | | | ( | | | | (_) \ V  V /\__ \
+#  \/  \/ \___/|_| |_|\_\|_| |_|\___/ \_/\_/ |___/
+#
+# This file was automatically generated by pkg/workflow/maintenance_workflow.go (v0.42.17). DO NOT EDIT.
+#
+# To regenerate this workflow, run:
+#   gh aw compile
+# For more information: https://github.com/github/gh-aw/blob/main/.github/aw/github-agentic-workflows.md
+#
+# Alternative regeneration methods:
+# make recompile
+# 
+# Or use the gh-aw CLI directly:
+# ./gh-aw compile --validate --verbose
+# 
+# The workflow is generated when any workflow uses the 'expires' field
+# in create-discussions, create-issues, or create-pull-request safe-outputs configuration.
+# Schedule frequency is automatically determined by the shortest expiration time.
+#
+name: Agentic Maintenance
+
+on:
+  schedule:
+    - cron: "37 */2 * * *"  # Every 2 hours (based on minimum expires: 1 days)
+  workflow_dispatch:
+
+permissions: {}
+
+jobs:
+  close-expired-entities:
+    runs-on: ubuntu-slim
+    permissions:
+      discussions: write
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Setup Scripts
+        uses: github/gh-aw/actions/setup@v0.42.17
+        with:
+          destination: /opt/gh-aw/actions
+
+      - name: Close expired discussions
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const { setupGlobals } = require('/opt/gh-aw/actions/setup_globals.cjs');
+            setupGlobals(core, github, context, exec, io);
+            const { main } = require('/opt/gh-aw/actions/close_expired_discussions.cjs');
+            await main();
+
+      - name: Close expired issues
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const { setupGlobals } = require('/opt/gh-aw/actions/setup_globals.cjs');
+            setupGlobals(core, github, context, exec, io);
+            const { main } = require('/opt/gh-aw/actions/close_expired_issues.cjs');
+            await main();
+
+      - name: Close expired pull requests
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          script: |
+            const { setupGlobals } = require('/opt/gh-aw/actions/setup_globals.cjs');
+            setupGlobals(core, github, context, exec, io);
+            const { main } = require('/opt/gh-aw/actions/close_expired_pull_requests.cjs');
+            await main();