chore: add community health files and CI workflow

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working
+labels: bug
+---
+
+**Describe the bug**
+A clear description of what the bug is.
+
+**To reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+What you expected to happen.
+
+**Browser / OS**

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea
+labels: enhancement
+---
+
+**What problem does this solve?**
+
+**Describe the solution you'd like**
+
+**Alternatives considered**

.github/pull_request_template.md

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+## What does this PR do?
+
+## Testing
+
+- [ ] Tests pass (`npm test`)
+- [ ] Linting passes (`npm run lint`)

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm run lint --if-present
+      - run: npm test

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [Unreleased]
+
+### Added
+- Initial public release
+- In-browser CNN and dense network training on MNIST, Fashion-MNIST, and CIFAR-10
+- Real-time training visualization

CONTRIBUTING.md

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+# Contributing
+
+## Development setup
+
+1. Install dependencies: `npm install` or `pnpm install`
+2. Start dev server: `npm run dev`
+3. Run tests: `npm test`
+
+## Pull requests
+
+- Open an issue first for significant changes
+- Keep PRs focused — one feature or fix per PR
+- Ensure tests pass before submitting
+
+## Code style
+
+This project uses ESLint. Run `npm run lint` before submitting.

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities by opening a GitHub issue with the label `security`.
+
+This project runs entirely in the browser — there is no server-side component or data collection.