benchmark

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## When to invoke this skill

Establishes
baselines for page load times, Core Web Vitals, and resource sizes.
Compares before/after on every PR. Tracks performance trends over time.
Use when: "performance", "benchmark", "page speed", "lighthouse", "web vitals",
"bundle size", "load time".

Voice triggers (speech-to-text aliases): "speed test", "check performance".

## Preamble (run first)

```bash
_SS="$HOME/.claude/skills/gstack/bin/gstack-skill-start"
[ -x "$_SS" ] || _SS=".claude/skills/gstack/bin/gstack-skill-start"
"$_SS" --skill "benchmark" --model "claude" --parent-pid "$PPID" \
  || echo "SKILL_START: unavailable — stale install; run ./setup or /gstack-upgrade (preamble degraded, continue the user's task)"
```

Read the echoed `KEY: value` STATUS lines — they drive every preamble rule
below. **Degraded mode:** if `SKILL_START_PROTO: 1` is missing from the output
(script absent, stale install, or a different protocol number), apply safe
defaults: treat `SESSION_KIND` as `interactive`, do NOT assume Conductor,
…