feat(mail): IMAP client — select, fetch headers/full, search

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

go.mod

@@ -2,16 +2,21 @@ module git.dcglab.co.uk/steve/emcli
 
 go 1.25.0
 
-require modernc.org/sqlite v1.53.0
+require (
+	github.com/emersion/go-imap v1.2.1
+	github.com/emersion/go-message v0.18.2
+	modernc.org/sqlite v1.53.0
+)
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/emersion/go-message v0.18.2 // indirect
+	github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	golang.org/x/sys v0.44.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
 	modernc.org/libc v1.73.4 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect