Package for public GitHub release

Add open-source scaffolding and CI; remove Claude-specific dev notes from the
published tree.

- Remove CLAUDE.md from tracking (kept locally, now git-ignored).
- CHANGELOG.md (Keep a Changelog; v1.0 → v1.1.1).
- SECURITY.md (private vuln reporting + operator guidance).
- CONTRIBUTING.md (dev setup, conventions, PR flow).
- .github/: bug + feature issue templates, PR template.
- .github/workflows/ci.yml: byte-compile, validate example config, docker build.
- .github/workflows/release.yml: on a version tag, publish a multi-arch
  (amd64 + arm64) image to GHCR.
- README: license/release/CI badges, prebuilt-image (GHCR) run instructions,
  and a corrected Python-version note (3.9–3.11; netifaces caveat).

Badges and image names use an `OWNER` placeholder to replace with the GitHub
namespace after the repo is created.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,29 @@
+---
+name: Bug report
+about: Report something that isn't working
+title: "[Bug] "
+labels: bug
+---
+
+**Describe the bug**
+A clear description of what's wrong.
+
+**To reproduce**
+Steps to reproduce the behavior:
+1. …
+2. …
+
+**Expected behavior**
+What you expected to happen.
+
+**Screenshots / logs**
+If applicable, add screenshots or server log output.
+
+**Environment**
+- ADS-Bit version (admin header or `GET /api/config`):
+- Install method: [ ] bare metal  [ ] Docker  [ ] Podman
+- OS / Python version:
+- Receiver / feed (e.g. dump1090, readsb) and how it's reached:
+
+**Additional context**
+Anything else that might help.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,18 @@
+---
+name: Feature request
+about: Suggest an idea or improvement
+title: "[Feature] "
+labels: enhancement
+---
+
+**What problem does this solve?**
+A clear description of the need or pain point.
+
+**Proposed solution**
+What you'd like to happen.
+
+**Alternatives considered**
+Any other approaches you thought about.
+
+**Additional context**
+Mockups, examples, or references.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+## Summary
+
+<!-- What does this PR change, and why? -->
+
+## Related issues
+
+<!-- e.g. Closes #123 -->
+
+## How was this tested?
+
+<!-- Commands run, manual steps, screenshots. For Docker changes, note that
+     `docker build` succeeds. -->
+
+## Checklist
+
+- [ ] Server starts and the change works locally (`python3 server.py`)
+- [ ] If admin assets changed, bumped the `?v=` cache-bust token in `admin/admin.html`
+- [ ] If behavior/version changed, updated `VERSION` and `CHANGELOG.md`
+- [ ] No secrets or local config committed (`config.json` stays ignored)

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  python:
+    name: Python checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Install dependencies
+        run: pip install -r requirements.txt
+      - name: Byte-compile server
+        run: python -m compileall -q server.py
+      - name: Validate example config is valid JSON
+        run: python -c "import json; json.load(open('config.json.example'))"
+
+  docker:
+    name: Docker build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build image
+        run: docker build -t ads-bit:ci .

.github/workflows/release.yml

@@ -0,0 +1,52 @@
+name: Release
+
+# Build and publish a multi-arch image to GitHub Container Registry (GHCR)
+# whenever a version tag is pushed (e.g. v1.1.2). Lets users run a prebuilt
+# image — including on Raspberry Pi (arm64) — without building locally.
+
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  image:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Compute lowercase image name
+        id: img
+        run: echo "name=ghcr.io/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"
+
+      - uses: docker/setup-qemu-action@v3
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker metadata (tags & labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ steps.img.outputs.name }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}