feat(ci): add dependency updates, lock-threads, and sweep workflows

.github/workflows/dependency-updates.yml

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+name: Dependency Updates
+
+on:
+  schedule:
+    - cron: '0 0 * * MON'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: dependency-updates-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-outdated:
+    name: check-outdated
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Check outdated packages (root)
+        run: bun outdated || true
+
+      - name: Install adapter dependencies
+        working-directory: adapters
+        run: bun install
+
+      - name: Check outdated packages (adapters)
+        working-directory: adapters
+        run: bun outdated || true
+
+  npm-audit:
+    name: npm-audit
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Run npm audit
+        run: npm audit --json > /tmp/audit-report.json || true
+
+      - name: Show audit summary
+        run: npm audit || true
+
+      - name: Fail on high severity vulnerabilities
+        run: |
+          HIGH=$(npm audit --audit-level=high 2>&1; echo "exit:$?")
+          echo "$HIGH"

.github/workflows/lock-closed-issues.yml

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+name: Lock Closed Issues
+
+on:
+  schedule:
+    - cron: '0 0 * * 0'
+  workflow_dispatch:
+
+permissions:
+  issues: write
+
+concurrency:
+  group: lock-closed-issues
+  cancel-in-progress: true
+
+jobs:
+  lock-closed-issues:
+    name: lock-closed-issues
+    runs-on: ubuntu-latest
+    steps:
+      - name: Lock closed issues
+        uses: dessant/lock-threads@v5
+        with:
+          github-token: ${{ github.token }}
+          issue-inactive-days: '30'
+          pr-inactive-days: '90'
+          process-only: 'issues, prs'

.github/workflows/sweep.yml

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+name: Sweep
+
+on:
+  schedule:
+    - cron: '0 0 * * 1'
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+
+concurrency:
+  group: sweep
+  cancel-in-progress: true
+
+jobs:
+  sweep:
+    name: sweep
+    runs-on: ubuntu-latest
+    steps:
+      - name: Stale issues and PRs
+        uses: actions/stale@v9
+        with:
+          days-before-issue-stale: 60
+          days-before-issue-close: 7
+          stale-issue-label: stale
+          stale-issue-message: >
+            This issue is stale because it has been open for 60 days with no
+            activity. If this is still an issue, please add a comment with an
+            update. Otherwise this issue will be closed in 7 days.
+          close-issue-message: This issue was closed because it has been stalled for 7 days with no activity.
+          days-before-pr-stale: 45
+          days-before-pr-close: 10
+          stale-pr-label: stale
+          stale-pr-message: >
+            This pull request is stale because it has been open for 45 days with
+            no activity. If you are still working on this, please add a comment
+            with an update. Otherwise this pull request will be closed in 10 days.
+          close-pr-message: This pull request was closed because it has been stalled for 10 days with no activity.
+          operations-per-run: 100
+          exempt-all-milestones: true
+          exempt-all-assignees: true