chore: add CodeQL workflow, PR template, and Dependabot version updates

Author: nigel-dev

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+    open-pull-requests-limit: 10
+    labels:
+      - dependencies
+    commit-message:
+      prefix: "chore(deps):"
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: monday
+    open-pull-requests-limit: 5
+    labels:
+      - dependencies
+      - ci
+    commit-message:
+      prefix: "ci(deps):"

.github/pull_request_template.md

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+## Summary
+
+Brief description of the changes.
+
+## Changes
+
+- 
+
+## Testing
+
+- [ ] `bun run build` passes
+- [ ] `bun test` passes
+- [ ] Manual testing done (if applicable)
+
+## Notes
+
+Any additional context or trade-offs worth mentioning.

.github/workflows/codeql.yml

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+name: CodeQL
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: '0 6 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze TypeScript
+    runs-on: ubuntu-latest
+
+    permissions:
+      security-events: write
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: javascript-typescript
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3