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>

internal/rpc/protocol_test.go

@@ -115,6 +115,8 @@ func TestAllOperations(t *testing.T) {
 		OpDepTree,
 		OpLabelAdd,
 		OpLabelRemove,
+		OpCommentList,
+		OpCommentAdd,
 	}
 
 	for _, op := range operations {