⚠️ Platform note — read before running any command. The shell snippets in this skill are written for macOS / Linux (bash/zsh). Always check which OS you are on first. On Windows do not run them verbatim — the underlying tool/CLI commands are usually cross-platform, but the surrounding shell syntax is not. Translate it to PowerShell before running:

bash (macOS / Linux)	PowerShell (Windows)
a && b	run as two steps, or a; if ($?) { b }
cat <<'EOF' | tool … (heredoc)	write the text to a temp file, then pipe/pass that file to the tool
VAR=$(cmd) … $VAR	$VAR = cmd … $VAR
cmd > /dev/null	cmd > $null
… | grep PAT	… | Select-String PAT
… | jq …	… | ConvertFrom-Json, then read the fields
python3 x.py	python x.py (or py x.py)
~/dir, /tmp	$env:USERPROFILE\dir, $env:TEMP
cp / mkdir -p / rm -rf	Copy-Item / New-Item -ItemType Directory -Force / Remove-Item -Recurse -Force

If a command has no obvious Windows equivalent, prefer the built-in file/HTTP tools over raw shell.

Data Dashboard (scene-layer on officecli-xlsx)

A dashboard is not "a spreadsheet with charts". It is a composition: one Dashboard sheet the user lands on with formula-driven KPI cards, cell-range-linked charts, sparklines, and semantic conditional formatting. Everything else (raw data, aggregations) is upstream infrastructure the user should never need to open. This skill teaches the composition pattern. Everything about the xlsx engine — cells, formulas, batch JSON, shell quoting, validate, HTML preview — comes from officecli-xlsx and is not re-taught here.