feat: LinkedIn Helper Chrome Extension MVP

[Alakazam03]

Builds the complete MVP for LinkedIn Helper — a Chrome extension that discovers relevant LinkedIn feed posts and helps craft thoughtful, non-spammy comments via OpenRouter.

What it does

demo_extension_popup_settings.mp4
Extension popup with settings configuration — API key, model, niche, topics, tone, and personal context.

Extension loaded in Chrome

Popup settings filled

Architecture

• Manifest V3 Chrome extension targeting linkedin.com/feed
• Popup UI — dark/gold classy theme for configuring OpenRouter API key, model (free + paid), niche, topics, avoid-topics, tone, personal bio
• Content script — MutationObserver-based feed scanning, keyword relevance scoring, subtle gold left-border highlight on matching posts, inline "Craft Comment" button
• Background service worker — OpenRouter API integration, 15/day rate limiting via chrome.storage
• Utils — LinkedIn DOM parser, relevance scorer, LLM prompt builder

Anti-spam design

• Never auto-posts — inserts draft into comment box, user presses Enter
• 15 comments/day hard limit with visible counter
• Prompt engineering enforces specific post references, forbids generic phrases
• Avoided topics are filtered out before highlighting

Files added

Path	Purpose
manifest.json	Extension manifest (V3)
src/popup/*	Settings popup (HTML/CSS/JS)
src/content/*	Feed injection (JS/CSS)
src/background/background.js	Service worker
src/utils/*	Parser, scorer, prompt builder
icons/*	Extension icons (16/48/128px)
AGENTS.md	Dev environment instructions

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