Switch remote deploy to vendored source builds

Move remote deployment to a vendored source bundle built on the target host via Docker so redeploys no longer require local cross-compilation or host Go installation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

vendor/github.com/rivo/uniseg/width.go

@@ -0,0 +1,61 @@
+package uniseg
+
+// EastAsianAmbiguousWidth specifies the monospace width for East Asian
+// characters classified as Ambiguous. The default is 1 but some rare fonts
+// render them with a width of 2.
+var EastAsianAmbiguousWidth = 1
+
+// runeWidth returns the monospace width for the given rune. The provided
+// grapheme property is a value mapped by the [graphemeCodePoints] table.
+//
+// Every rune has a width of 1, except for runes with the following properties
+// (evaluated in this order):
+//
+//   - Control, CR, LF, Extend, ZWJ: Width of 0
+//   - \u2e3a, TWO-EM DASH: Width of 3
+//   - \u2e3b, THREE-EM DASH: Width of 4
+//   - East-Asian width Fullwidth and Wide: Width of 2 (Ambiguous and Neutral
+//     have a width of 1)
+//   - Regional Indicator: Width of 2
+//   - Extended Pictographic: Width of 2, unless Emoji Presentation is "No".
+func runeWidth(r rune, graphemeProperty int) int {
+	switch graphemeProperty {
+	case prControl, prCR, prLF, prExtend, prZWJ:
+		return 0
+	case prRegionalIndicator:
+		return 2
+	case prExtendedPictographic:
+		if property(emojiPresentation, r) == prEmojiPresentation {
+			return 2
+		}
+		return 1
+	}
+
+	switch r {
+	case 0x2e3a:
+		return 3
+	case 0x2e3b:
+		return 4
+	}
+
+	switch propertyEastAsianWidth(r) {
+	case prW, prF:
+		return 2
+	case prA:
+		return EastAsianAmbiguousWidth
+	}
+
+	return 1
+}
+
+// StringWidth returns the monospace width for the given string, that is, the
+// number of same-size cells to be occupied by the string.
+func StringWidth(s string) (width int) {
+	state := -1
+	for len(s) > 0 {
+		var w int
+		_, s, w, state = FirstGraphemeClusterInString(s, state)
+		width += w
+	}
+	return
+}