diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
new file mode 100644
index 0000000..7a95bdc
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -0,0 +1,56 @@
+name: Bug report
+description: Report a reproducible problem in code, packaging, docs, or workflows.
+title: "[Bug]: "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please include enough detail for someone else to reproduce the problem.
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: What went wrong?
+      placeholder: A concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Provide exact steps, commands, or code to reproduce the issue.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      placeholder: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: Include OS, Python version, PyTorch version, CUDA version, and install method if relevant.
+      placeholder: |
+        - OS:
+        - Python:
+        - PyTorch:
+        - CUDA:
+        - Install method:
+    validations:
+      required: false
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs or screenshots
+      description: Paste traceback, logs, or screenshots if relevant.
+    validations:
+      required: false
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 0000000..78980c0
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,5 @@
+blank_issues_enabled: true
+contact_links:
+  - name: Security report
+    url: mailto:ymjiii98@gmail.com
+    about: Report security vulnerabilities privately by email instead of opening a public issue.
diff --git a/.github/ISSUE_TEMPLATE/feature_request.yml b/.github/ISSUE_TEMPLATE/feature_request.yml
new file mode 100644
index 0000000..99d9d15
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/feature_request.yml
@@ -0,0 +1,34 @@
+name: Feature request
+description: Suggest an improvement to the library, docs, benchmarks, or workflows.
+title: "[Feature]: "
+labels:
+  - enhancement
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem or motivation
+      description: What user need, workflow pain point, or limitation does this address?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed change
+      description: Describe the feature, API, workflow, or docs improvement you want.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Optional. Describe workarounds or alternative approaches.
+    validations:
+      required: false
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Benchmarks, references, links, or example usage.
+    validations:
+      required: false
diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..0b50a89
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,15 @@
+## Summary
+
+- what changed
+- why it changed
+
+## Validation
+
+- [ ] tests passed locally
+- [ ] docs/build checks passed locally when relevant
+- [ ] CI is expected to pass
+
+## Notes
+
+- affected areas:
+- follow-up work, if any:
diff --git a/.github/workflows/retire_repo_pages.yml b/.github/workflows/retire_repo_pages.yml
deleted file mode 100644
index 19bc5bc..0000000
--- a/.github/workflows/retire_repo_pages.yml
+++ /dev/null
@@ -1,40 +0,0 @@
-name: Retire Repo Pages
-
-on:
-  push:
-    branches: [main]
-    paths:
-      - ".github/workflows/retire_repo_pages.yml"
-      - "deprecated_pages/**"
-  workflow_dispatch:
-
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-concurrency:
-  group: retire-repo-pages
-  cancel-in-progress: true
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Configure Pages
-        uses: actions/configure-pages@v5
-
-      - name: Upload retirement site
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: deprecated_pages
-
-      - name: Deploy retirement site
-        id: deployment
-        uses: actions/deploy-pages@v4
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
new file mode 100644
index 0000000..278be5e
--- /dev/null
+++ b/CODE_OF_CONDUCT.md
@@ -0,0 +1,53 @@
+# Code of Conduct
+
+## Our Pledge
+
+We want INFTY to be an open, constructive, and respectful project for everyone involved in its development and use.
+
+Contributors, maintainers, and community members are expected to participate in a way that supports a welcoming environment for people of different backgrounds, identities, experience levels, and perspectives.
+
+## Expected Behavior
+
+Examples of behavior that contribute to a positive environment include:
+
+- being respectful in technical discussions
+- giving and receiving feedback in good faith
+- focusing on the issue, code, or design rather than the person
+- showing empathy and patience when others ask questions or make mistakes
+- using clear and professional language in issues, pull requests, and review comments
+
+## Unacceptable Behavior
+
+Examples of unacceptable behavior include:
+
+- harassment, intimidation, or personal attacks
+- discriminatory or derogatory language
+- trolling, baiting, or deliberately inflammatory behavior
+- publishing private information without permission
+- sustained disruptive behavior in issues, pull requests, or other public channels
+
+## Scope
+
+This Code of Conduct applies in all project spaces, including:
+
+- GitHub issues
+- pull requests and code review
+- repository discussions and related public communication
+
+## Reporting
+
+If you experience or observe behavior that violates this Code of Conduct, please report it privately to:
+
+- `ymjiii98@gmail.com`
+
+Please include relevant context, links, screenshots, or other details if available.
+
+## Enforcement
+
+Project maintainers may remove, edit, or reject comments, commits, code, issues, or other contributions that violate this Code of Conduct.
+
+Maintainers may also temporarily or permanently restrict participation for repeated or severe violations.
+
+## Attribution
+
+This document is a lightweight project-specific adaptation inspired by common open source community conduct guidelines, including Contributor Covenant.
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 0000000..e76ccaf
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,32 @@
+# Security Policy
+
+## Reporting a vulnerability
+
+If you believe you have found a security vulnerability in INFTY, please do not open a public GitHub issue.
+
+Instead, report it privately to:
+
+- `ymjiii98@gmail.com`
+
+Please include the following when possible:
+
+- a clear description of the issue
+- the affected component or file path
+- reproduction steps or a proof of concept
+- the potential impact
+- any suggested remediation
+
+We will review reports as time permits and aim to acknowledge valid reports promptly.
+
+## Scope
+
+This project is primarily a research and engineering toolkit. Security reports are still welcome, especially for:
+
+- package installation or release artifacts
+- workflow or secret-handling issues
+- unsafe file handling or code execution paths
+- dependency-related exposure in supported usage paths
+
+## Disclosure
+
+Please allow reasonable time for investigation and remediation before public disclosure.
diff --git a/theme_overrides/main.html b/theme_overrides/main.html
index 3f1097f..19e5098 100644
--- a/theme_overrides/main.html
+++ b/theme_overrides/main.html
@@ -13,3 +13,26 @@
     <title>{{ browser_title }}</title>
   {% endif %}
 {% endblock %}
+
+{% block extrahead %}
+  {{ super() }}
+  {% if config.repo_url %}
+    <script>
+      (() => {
+        const sourceKey = `${__md_scope.pathname}.__source`;
+        const sourceRepoKey = `${__md_scope.pathname}.__source_repo`;
+        const currentRepo = {{ config.repo_url | tojson }};
+        try {
+          const cachedRepo = JSON.parse(sessionStorage.getItem(sourceRepoKey) || "null");
+          if (cachedRepo !== currentRepo) {
+            sessionStorage.removeItem(sourceKey);
+            sessionStorage.setItem(sourceRepoKey, JSON.stringify(currentRepo));
+          }
+        } catch (_) {
+          sessionStorage.removeItem(sourceKey);
+          sessionStorage.setItem(sourceRepoKey, JSON.stringify(currentRepo));
+        }
+      })();
+    </script>
+  {% endif %}
+{% endblock %}