[Epic] Add Windows support

[shellen]

Summary

Port Pull Read to Windows 10 (1803+) and Windows 11. The codebase is well-positioned — core logic (feed parsing, extraction, Markdown writing, viewer server) is pure TypeScript with no platform dependencies. The main work is config paths, secret storage, CI pipeline, and testing.

Research: See docs/plans/2026-02-24-windows-port.md for full analysis.

Estimated effort: ~3–4 days for MVP, ~5–6 days polished with Copilot Runtime.

Architecture — What's Already Cross-Platform

Layer	Platform-specific?	Notes
Feed parsing (feed.ts)	No	Pure TypeScript
Article extraction (extractor.ts)	No	linkedom + Readability
Markdown writer (writer.ts)	No	Pure TypeScript
Viewer server (viewer.ts)	No	Node HTTP server
Summarizer (summarizer.ts)	Partially	Apple Intelligence is macOS-only
TTS (tts providers)	Partially	Browser TTS + cloud are cross-platform; Kokoro is local
Config paths	Yes	~/.config/pullread/ → %APPDATA%\pullread\
API key storage	Yes	macOS Keychain → Windows Credential Manager
Cookie extraction	Yes	macOS-specific Safari/Chrome cookie access

MVP Checklist

• Platform-aware config paths ([Task] Platform-aware config paths for Windows #74)
• Abstract API key storage for Windows Credential Manager ([Task] Abstract API key storage for Windows Credential Manager #75)
• CI build matrix — Windows targets ([Task] CI build matrix — Windows targets #76)
• Windows code signing (Authenticode) ([Task] Windows code signing (Authenticode) #77)
• Cookie extraction on Windows ([Task] Cookie extraction on Windows #78)
• WebView2 rendering and cross-platform testing ([Task] WebView2 rendering and cross-platform testing #79)

Nice-to-Have

• Windows Copilot Runtime — on-device summarization ([Task] Windows Copilot Runtime integration (on-device summarization) #80)
• Auto-updater for Windows ([Task] Auto-updater for Windows #81)
• System tray on Windows ([Task] System tray on Windows #82)

Risks

• WebView2 differences: Edge-based WebView2 vs macOS WKWebView may have rendering differences in viewer HTML
• Font rendering: Self-hosted fonts (Work Sans, etc.) may render differently — ClearType vs macOS font smoothing
• Kokoro TTS: Local TTS model loading may behave differently on Windows
• No Safari cookies: Windows users can't import Safari reading sessions

Decision

Recommend deferring until after current feature work stabilizes (v0.4.0 timeframe) to avoid splitting focus.