docs: update README, Windows plan, and launch drafts for Windows support

- README: platform-specific Quick Start, install/uninstall table
- Windows plan: Phase 2 complete, Phase 3 scoped
- Launch drafts: updated "Does it support Windows?" response

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -15,16 +15,32 @@ Built from scratch in Rust. Zero DNS libraries. RFC 1035 wire protocol parsed by
 ## Quick Start
 
 ```bash
+# macOS
 brew install razvandimescu/tap/numa
-# or: cargo install numa
-# or: curl -fsSL https://raw.githubusercontent.com/razvandimescu/numa/main/install.sh | sh
 
-sudo numa                              # port 53 requires root
+# Linux
+curl -fsSL https://raw.githubusercontent.com/razvandimescu/numa/main/install.sh | sh
+
+# Windows — download from GitHub Releases
+# All platforms
+cargo install numa
+```
+
+```bash
+sudo numa                              # run in foreground (port 53 requires root/admin)
 ```
 
 Open the dashboard: **http://numa.numa** (or `http://localhost:5380`)
 
-Set as system DNS: `sudo numa install`
+Set as system DNS:
+
+| Platform | Install | Uninstall |
+|----------|---------|-----------|
+| macOS | `sudo numa install` | `sudo numa uninstall` |
+| Linux | `sudo numa install` | `sudo numa uninstall` |
+| Windows | `numa install` (admin) + reboot | `numa uninstall` (admin) + reboot |
+
+On macOS and Linux, numa runs as a system service (launchd/systemd). On Windows, numa auto-starts on login via registry.
 
 ## Local Services
 
@@ -80,7 +96,7 @@ From Machine B: `curl http://api.numa` → proxied to Machine A's port 8000. Ena
 | Ad blocking | Yes | Yes | — | 385K+ domains |
 | Web admin UI | Full | Full | — | Dashboard |
 | Encrypted upstream (DoH) | Needs cloudflared | Yes | — | Native |
-| Portable (laptop) | No (appliance) | No (appliance) | Server | Single binary |
+| Portable (laptop) | No (appliance) | No (appliance) | Server | Single binary, macOS/Linux/Windows |
 | Community maturity | 56K stars, 10 years | 33K stars | 20 years | New |
 
 ## Performance

docs/implementation/windows-support-plan.md

@@ -0,0 +1,49 @@
+# Windows Support — Implementation Plan
+
+*March–April 2026*
+
+## Phase 1: Run on Windows without system integration — DONE (v0.3.0)
+
+- [x] Cross-platform `config_dir()` and `data_dir()`
+- [x] `src/system_dns.rs` — Windows DNS discovery via `ipconfig /all`
+- [x] Stubs for install/uninstall/service on unsupported OS
+- [x] Multicast LAN discovery (`SO_REUSEPORT` skipped on Windows)
+- [x] All deps compile on windows-msvc
+- [x] CI: `check-windows` job (build + clippy)
+- [x] Cross-platform LAN discovery tested: macOS ↔ Windows
+
+## Phase 2: DNS configuration — DONE (PR #28)
+
+- [x] `numa install` — set DNS to 127.0.0.1 via `netsh` for all active interfaces
+- [x] `numa uninstall` — restore DNS from backup (DHCP or static with secondaries)
+- [x] `ipconfig /all` parser — per-interface adapter name, DHCP status, DNS servers
+- [x] Localization — German adapter/DHCP/DNS labels handled
+- [x] Disconnected adapters — skipped
+- [x] Backup — `%PROGRAMDATA%\numa\original-dns.json`
+- [x] Dnscache — disable via registry on install, re-enable on uninstall (reboot required)
+- [x] Auto-start — registry Run key (`HKLM\...\Run\Numa`) on install, removed on uninstall
+- [x] UDP ConnectionReset — Windows ICMP error 10054 caught and ignored
+- [x] IP validation — added to `discover_windows()`
+- [x] CI: `cargo test` + binary artifact upload on Windows
+- [ ] `README.md` — add Windows install instructions
+
+## Phase 3: Full service integration (future)
+
+### Windows Service
+
+- Use `windows-service` crate to register Numa as a Windows Service
+- `sc.exe create numa binPath=...` as alternative
+- Auto-start on boot (SYSTEM context, no login required), auto-restart on crash
+- Replace registry Run key with proper SCM integration
+
+### CA trust
+
+- `certutil.exe -addstore Root ca.pem` to trust Numa CA system-wide
+- Reverse: `certutil.exe -delstore Root "Numa Local CA"`
+- Needs admin elevation
+
+### DHCP DNS detection
+
+- Current `detect_dhcp_dns()` returns `None` on Windows
+- Could parse `ipconfig /all` for "DHCP Server" + "DNS Servers" lines
+- Or use WinAPI `GetNetworkParams()`

docs/marketing/launch-drafts.md

@@ -614,5 +614,7 @@ auto-revert. Different audiences: Technitium targets server admins, Numa
 targets developers on laptops.
 
 **"Does it support Windows?"**
-macOS and Linux are the primary targets. Windows has scaffolding in the code
-but is not tested. If there's demand, it's on the list.
+Yes. `numa install` in an admin terminal sets system DNS and auto-starts
+numa on boot. Requires a reboot (Windows DNS Client holds port 53 at kernel
+level). `numa uninstall` restores everything. Native Windows Service
+integration is next.