chore: add LICENSE, README, VERSION, .editorconfig, expand .gitignore

Add project housekeeping files and sync manifest version to 0.1.0.
Also stages previously untracked chat summaries and score-ratio docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -0,0 +1,36 @@
+# Reddit Tweaks Firefox Extension
+
+> **Note:** This project was built with the aid of [Cursor](https://cursor.com) and Claude.
+
+This is a personal project, kept public for reference only. It will never be published to AMO (addons.mozilla.org). If you use it, expect to customize things to your own taste — it's opinionated by design.
+
+## What it does
+
+A Firefox extension that reskins [old.reddit.com](https://old.reddit.com) with a handful of visual tweaks:
+
+- **Badge layout** — replaces the default subreddit link and comment count with styled badges
+- **Card layout** — wraps posts in rounded cards with configurable density, spacing, and background style
+- **Font override** — swaps in Reddit Sans (and Reddit Mono for code blocks) site-wide
+- **Color customization** — per-subreddit badge colors via an inline HSV picker
+- **Theming** — separate light/dark palettes with automatic RES night-mode detection
+
+## Installation
+
+1. Clone or download this repo
+2. Open Firefox and navigate to `about:debugging#/runtime/this-firefox`
+3. Click **Load Temporary Add-on...**
+4. Select the `manifest.json` file from this repo's root
+
+The extension will stay loaded until you close Firefox. Repeat step 2-4 after restart.
+
+## Settings
+
+Click the extension icon in the toolbar to open the settings popup. All toggles, color pickers, density controls, and presets live there.
+
+## Fonts
+
+Reddit Sans, Reddit Sans Condensed, and Reddit Mono are bundled under the [SIL Open Font License 1.1](content/fonts/OFL.txt). See that file for full license text and copyright info.
+
+## License
+
+Extension code is [MIT](LICENSE). Bundled fonts are under the [SIL Open Font License 1.1](content/fonts/OFL.txt).