feat: status line helper scripts and setup documentation

Bash and PowerShell helpers for Claude Code statusLine. Setup docs with fallback note for non-Claude agents.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/ctask-statusline.ps1

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+# ctask status line helper for Claude Code
+# Reads ctask environment variables and prints a formatted context string.
+# Output: (ctask:<slug>|<mode>) <workspace_path>
+# Outputs nothing when not in a ctask session.
+
+if (-not $env:CTASK_TASK) { exit 0 }
+
+Write-Output "(ctask:$($env:CTASK_TASK)|$($env:CTASK_MODE)) $($env:CTASK_WORKSPACE)"

scripts/ctask-statusline.sh

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+#!/usr/bin/env bash
+# ctask status line helper for Claude Code
+# Reads ctask environment variables and prints a formatted context string.
+# Output: (ctask:<slug>|<mode>) <workspace_path>
+# Outputs nothing when not in a ctask session.
+
+[ -z "$CTASK_TASK" ] && exit 0
+
+echo "(ctask:${CTASK_TASK}|${CTASK_MODE}) ${CTASK_WORKSPACE}"