🌱 Add governance workflows and tooling conformance

.github/workflows/ci-signed-commits.yml

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+name: Check Signed Commits
+on: pull_request_target
+
+jobs:
+  signed-commits:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-signed-commits.yml@main
+    permissions:
+      contents: read
+      pull-requests: write

.github/workflows/non-main-gatekeeper.yml

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+name: Non-Main Gatekeeper
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  gatekeeper:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-non-main-gatekeeper.yml@main

.github/workflows/prow-github.yml

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+name: Prow Commands
+on:
+  issue_comment:
+    types: [created]
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  prow:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-prow-commands.yml@main

.github/workflows/prow-pr-automerge.yml

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+name: Prow Auto-merge
+on:
+  schedule:
+    - cron: "*/15 * * * *"
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  auto-merge:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-prow-automerge.yml@main

.github/workflows/prow-pr-remove-lgtm.yml

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+name: Prow Remove LGTM
+on: pull_request
+
+permissions:
+  pull-requests: write
+
+jobs:
+  remove-lgtm:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-prow-remove-lgtm.yml@main

.github/workflows/stale.yml

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+name: Mark Stale Issues
+on:
+  schedule:
+    - cron: '0 1 * * *'
+
+jobs:
+  stale:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-stale.yml@main
+    permissions:
+      issues: write
+      pull-requests: write

.github/workflows/unstale.yml

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+name: Unstale Issues
+on:
+  issues:
+    types: [reopened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  unstale:
+    uses: llm-d/llm-d-infra/.github/workflows/reusable-unstale.yml@main
+    permissions:
+      issues: write

.pre-commit-config.yaml

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+repos:
+  # general pre-commit hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-json
+      - id: check-added-large-files
+        args: [--maxkb=1000]
+      - id: check-merge-conflict
+      - id: mixed-line-ending
+      - id: check-case-conflict

OWNERS

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+approvers:
+- chcost
+- robertgshaw2-redhat
+- smarterclayton