feat: add portable Claude Code statusline kit

Replicating the cship-based statusline across machines meant manually
copying three files and hand-editing settings.json with per-user absolute
paths — error-prone and slow. Bundling the assets with an idempotent
installer that resolves the pwsh path at runtime and merges into an
existing settings.json makes rollout a single command per PC.

assets/cship-statusline.ps1

@@ -0,0 +1,60 @@
+# cship statusline wrapper
+# Runs cship, then converts its usage_limits markers (§ 5|7 § pct § reset §)
+# into progress bars styled identically to the context_bar module.
+$ErrorActionPreference = 'SilentlyContinue'
+[Console]::InputEncoding  = New-Object System.Text.UTF8Encoding $false
+[Console]::OutputEncoding = New-Object System.Text.UTF8Encoding $false
+$OutputEncoding           = New-Object System.Text.UTF8Encoding $false
+
+$cship = Join-Path $env:USERPROFILE '.local\bin\cship.exe'
+
+# Read the full Claude Code session JSON from stdin, hand it to cship.
+$inp  = [Console]::In.ReadToEnd()
+$out  = $inp | & $cship
+# Starship's prompt carries a leading blank line (add_newline); drop leading/trailing
+# blank lines so the statusline doesn't waste a row.
+$text = ($out -join "`n").Trim("`r", "`n")
+
+$S   = [char]0x00A7
+$esc = [char]0x1B
+$rx  = [regex]("$S([57])$S([0-9.]+)$S([^$S]*)$S")
+
+$render = [System.Text.RegularExpressions.MatchEvaluator]{
+    param($m)
+    $type  = $m.Groups[1].Value
+    $pct   = [double]$m.Groups[2].Value
+    $reset = $m.Groups[3].Value
+
+    $width   = 10
+    $filled  = [int][math]::Round($pct / 100.0 * $width)
+    if ($filled -lt 0)      { $filled = 0 }
+    if ($filled -gt $width) { $filled = $width }
+    $bar = ([string]([char]0x2588) * $filled) + ([string]([char]0x2591) * ($width - $filled))
+
+    # Same thresholds/colors as context_bar: warn >=40 (yellow), critical >=70 (bold red)
+    if     ($pct -ge 70) { $color = '1;31' }
+    elseif ($pct -ge 40) { $color = '33' }
+    else                 { $color = '38;2;125;207;255' }
+
+    if ($type -eq '5') { $label = '⏳ 5h' } else { $label = '📅 7d' }
+    $pctTxt   = '{0:0}%' -f $pct
+    $resetTxt = if ([string]::IsNullOrWhiteSpace($reset)) { '' } else { " ($reset)" }
+
+    "$esc[${color}m$label $bar $pctTxt$resetTxt$esc[0m"
+}
+
+# Compact the context_window token count marker (§T§<n>§) to K/M form, e.g.
+# 42329 -> 42.3K. cship has no native thousands formatting, so it's done here.
+$rxTok    = [regex]("${S}T${S}([0-9]+)${S}")
+$renderTok = [System.Text.RegularExpressions.MatchEvaluator]{
+    param($m)
+    $n  = [double]$m.Groups[1].Value
+    $ic = [Globalization.CultureInfo]::InvariantCulture
+    if     ($n -ge 1000000) { $v = ($n / 1000000).ToString('0.0', $ic) + 'M' }
+    elseif ($n -ge 1000)    { $v = ($n / 1000).ToString('0.0', $ic) + 'K' }
+    else                    { $v = $n.ToString('0', $ic) }
+    $v -replace '\.0([KM]?)$', '$1'
+}
+$text = $rxTok.Replace($text, $renderTok)
+
+[Console]::Out.Write($rx.Replace($text, $render))

assets/cship.toml

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+# cship — Claude Code statusline (Hero / Recommended + usage progress bars)
+# Reference: https://cship.dev
+[cship]
+lines = [
+  "$starship_prompt",
+  "$cship.model $cship.effort $cship.context_window.total_input_tokens $cship.context_bar $cship.peak_usage $cship.usage_limits",
+]
+
+[cship.model]
+symbol = "🤖 "
+style  = "bold cyan"
+
+[cship.effort]
+symbol      = "⚡ "
+style       = "fg:#7dcfff"
+high_style  = "fg:#e0af68"
+xhigh_style = "bold fg:#e0af68"
+max_style   = "bold fg:#f7768e"
+
+[cship.context_bar]
+symbol             = "🧠 "
+filled_char        = "█"
+empty_char         = "░"
+format             = "[$symbol$value]($style)"
+width              = 10
+style              = "fg:#7dcfff"
+warn_threshold     = 40.0
+warn_style         = "yellow"
+critical_threshold = 70.0
+critical_style     = "bold red"
+
+# $value is emitted inside a §T§…§ marker so the statusline wrapper can
+# compact the raw token count (e.g. 42329 → 42.3K) before display.
+[cship.context_window.total_input_tokens]
+symbol = "🔢 "
+style  = "fg:#a9b1d6"
+format = "[$symbol§T§$value§]($style)"
+
+# usage_limits emits machine markers (§TYPE§pct§reset§); the statusline wrapper
+# turns them into progress bars styled like context_bar. Thresholds >100 so cship
+# adds no ANSI of its own around the markers.
+[cship.usage_limits]
+style              = ""
+separator          = "   "
+five_hour_format   = "§5§{pct}§{reset}§"
+seven_day_format   = "§7§{pct}§{reset}§"
+warn_threshold     = 101
+critical_threshold = 101
+
+[cship.peak_usage]
+symbol = "⏰ "
+style  = "fg:#e0af68"