docs: Add fork notes, changelog and notice

CHANGELOG.md

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+# Changelog
+
+Fork-specific changes only. Upstream releases are documented at
+https://github.com/dermotduffy/advanced-camera-card/releases
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+Fork versions carry the upstream version they are built from plus a `+flan.N`
+build identifier.
+
+## [8.0.2+flan.1] - 2026-09-04
+
+### Added
+
+- `cameras[].media.severities` restricts review media to the listed severities,
+  so the thumbnail bar, media gallery and timeline can be pinned to Frigate
+  alerts (`[high]`) instead of showing every detection. Resolved into the
+  default query alongside `media.reviewed`, and overridden by an explicit
+  severity chosen in the media filter drawer. Unset means all severities.

FORK.md

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+# Fork notes
+
+A fork of [Advanced Camera Card](https://github.com/dermotduffy/advanced-camera-card),
+carrying one change on top of upstream `main`.
+
+## What this fork adds
+
+### `cameras[].media.severities`
+
+Upstream issues review queries with no severity filter, so the thumbnail bar
+("side ribbon"), the media gallery and the timeline show every Frigate review
+item — alerts and detections alike — regardless of what a camera is configured
+to alert on. Severity can only be narrowed interactively, in the media filter
+drawer, and that choice does not persist.
+
+`media.severities` restricts review media to the listed severities, resolved
+into the default query the same way `media.reviewed` already is:
+
+```yaml
+type: custom:advanced-camera-card
+cameras:
+  - camera_entity: camera.front_doorbell
+    media:
+      severities:
+        - high
+```
+
+| Value    | Frigate equivalent |
+| -------- | ------------------ |
+| `high`   | alert              |
+| `medium` | detection          |
+| `low`    | (no equivalent)    |
+
+An explicit severity chosen in the media filter drawer still wins, so the
+interactive filter keeps working. Unset means all severities, so a config that
+does not mention `severities` behaves exactly as upstream does.
+
+## Keeping up with upstream
+
+```bash
+git remote add upstream https://github.com/dermotduffy/advanced-camera-card.git
+git fetch upstream
+git merge upstream/main
+yarn install --immutable && yarn typecheck && yarn lint && yarn test
+```
+
+`dist/` is not committed (as upstream), so a merge should never conflict on
+build output.
+
+## Releasing to HACS
+
+HACS installs this card from **GitHub release assets**, not from the branch.
+That is not a preference — `gather_files_to_download()` in HACS
+(`custom_components/hacs/repositories/base.py`) skips every file under `dist/`
+whose basename does not start with `dist`, and this card's build emits a chunk
+named `dist-<hash>.js`. A branch install would therefore fetch that single
+chunk and nothing else.
+
+To cut a release:
+
+```bash
+RELEASE_VERSION=<version> yarn build
+gh release create <tag> dist/*.js --repo <mirror> --title <tag> --notes '...'
+```
+
+Every file in `dist/` must be attached, `advanced-camera-card.js` included —
+HACS matches that name to decide the repository is release-based, then
+downloads all assets of the release.

NOTICE

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+This repository is a fork of Advanced Camera Card by Dermot Duffy:
+
+    https://github.com/dermotduffy/advanced-camera-card
+
+Upstream code is used under the terms of the LICENSE file in this repository,
+which is unchanged from upstream. All upstream copyright remains with its
+authors.
+
+Fork-specific changes (see FORK.md) were developed with AI assistance
+(Anthropic Claude).