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_15-04-summary.md

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+# Score Ratio Badge — Subagent-Driven Implementation
+
+**Date:** 2026-08-27 15:04
+**Task:** Implement the Score Ratio Badge feature using Subagent-Driven Development
+
+## Changes Made
+
+### Task 1: Settings infrastructure + popup toggle (`dfaca51`)
+- Added `scoreRatio: true` to DEFAULTS in `lib/settings.js`
+- Added "Score ratio badge" checkbox to `popup/popup.html` in Card Layout section
+- Wired `populateControls`, `saveFromControls`, and change listener in `popup/popup.js`
+
+### Task 2: Font Awesome solid subset + ratio badge CSS (`93931a8`)
+- Downloaded FA 6.7.2 solid woff2 to `content/fonts/fontawesome/fa-solid-900.woff2` (sha256 verified)
+- Created `content/styles/fontawesome-scoped.css` — scoped FA selectors under `.rt-badge--ratio`
+- Created `content/styles/ratio.css` — temperature-colored badges using CSS custom properties, dark mode via `.rt-dark`, neutral state, hover override
+- Added both CSS files to manifest
+
+### Task 3: Core ratio module + main.js integration (`2db30fd`)
+- Created `content/tweaks/ratio.js` — IIFE module with score parsing (title attr, k/m suffixes, bullet detection), comment count parsing, ratio computation, HSL hue mapping, badge DOM injection
+- Wired into `main.js` at all 5 integration points (init, post observer, dark mode observer, storage reload trigger, settings update)
+- Added `ratio.js` to manifest JS array
+
+## Review Results
+
+- All 3 per-task reviews: Spec ✅, Approved
+- Final whole-branch review: Ready to merge (no Critical/Important issues blocking)
+- Minor findings noted: `data-rt-ratio-processed` set before insertion confirm, observer dependency on badgeLayout/cardLayout (accepted), accessibility context on badges
+
+## Follow-up Items
+
+- Consider `title` attribute on badges for tooltip/accessibility (e.g. "Score per comment: 12.7")
+- Dark mode edge case: score-ratio-only mode (both layouts off) won't get `.rt-dark` class — document as unsupported or add shared dark-mode helper
+- Move `data-rt-ratio-processed` to after successful insertion for minor hardening
+- Doc naming drift: spec file is `vote-ratio-badge-design.md` but feature is "score ratio"