Add native Windows support (#91)

- Native Windows daemon using TCP loopback endpoints
- Direct-mode fallback for CLI/daemon compatibility
- Comment operations over RPC
- PowerShell installer script
- Go 1.24 requirement
- Cross-OS testing documented

Co-authored-by: danshapiro <danshapiro@users.noreply.github.com>
Amp-Thread-ID: https://ampcode.com/threads/T-c6230265-055f-4af1-9712-4481061886db
Co-authored-by: Amp <amp@ampcode.com>

commands/daemon.md

@@ -10,6 +10,8 @@ Run a background daemon that manages database connections and optionally syncs w
 - **Local daemon**: Socket at `.beads/bd.sock` (per-repository)
 - **Global daemon**: Socket at `~/.beads/bd.sock` (all repositories)
 
+> On Windows these files store the daemon’s loopback TCP endpoint metadata—leave them in place so bd can reconnect.
+
 ## Common Operations
 
 - **Start**: `bd daemon` or `bd daemon --global`