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>

chat-summaries/2026-08-27_05-40-summary.md

@@ -0,0 +1,35 @@
+# Reddit Fonts Override Feature
+
+**Date:** 2026-08-27
+**Task:** Add Reddit's modern fonts (Reddit Sans, Reddit Sans Condensed, Reddit Mono) to the Firefox extension, overriding old Reddit's default fonts.
+
+## Changes Made
+
+### New Files
+- `content/fonts/RedditSans[wght].woff2` — Reddit Sans variable font (~96KB)
+- `content/fonts/RedditSansCondensed[wght].woff2` — Reddit Sans Condensed variable font (~94KB)
+- `content/fonts/RedditMono[wght].woff2` — Reddit Mono variable font (~81KB)
+- `content/fonts/OFL.txt` — SIL Open Font License
+- `content/styles/fonts.css` — @font-face declarations and font-family overrides gated on `html.rt-fonts-enabled`
+
+### Modified Files
+- `manifest.json` — Added `content/styles/fonts.css` to CSS array
+- `lib/settings.js` — Added `fontOverride: true` default
+- `content/main.js` — Toggle `rt-fonts-enabled` class, reload on fontOverride change, removed debug console.log
+- `popup/popup.html` — Added "Reddit fonts" checkbox
+- `popup/popup.js` — Wired fontOverride checkbox (populate, save, listener)
+
+### Design & Planning
+- `docs/superpowers/specs/2026-08-27-reddit-fonts-design.md` — Design spec
+- `docs/superpowers/plans/2026-08-27-reddit-fonts.md` — Implementation plan
+
+## Architecture
+- Fonts from [reddit/redditsans](https://github.com/reddit/redditsans), SIL OFL 1.1 licensed
+- Variable-weight woff2 files (one per family, all weights via `wght` axis)
+- CSS-only @font-face + class toggle pattern (matches existing card/badge approach)
+- Reddit Sans applied to all body text; Reddit Mono to code/pre elements; Condensed declared but not force-applied
+- Toggleable from popup, on by default
+
+## Follow-up Items
+- Manual Firefox testing recommended (load extension, verify fonts render, toggle on/off)
+- Task 3 commit includes some unrelated pre-existing card-density changes (cosmetic, not a functional issue)