feat(skills): add /ponytail-gain measured-impact scoreboard (#108)

A one-shot scoreboard showing ponytail's measured benchmark impact (less code, less cost, more speed) as plain ASCII bars, then points to /ponytail-debt and /ponytail-audit for this repo's real numbers. Complements the existing skills rather than duplicating them: debt harvests the ponytail: ledger, audit finds what's cuttable, gain shows the measured why-it-matters. No per-repo savings number is ever printed -- the unbuilt version was never written, so there is no real baseline to subtract from in a live repo. The bars carry the published benchmark medians (5 tasks, 3 models); per-repo figures come from debt's count. Ships every adapter the other commands ship: Claude commands/*.toml, OpenCode .opencode/command/*.md, OpenClaw skill (generated), Pi command registration. Help card, command enumeration, portability table, and README updated in the same change. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-19 00:24:37 +02:00
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+---
+name: ponytail-gain
+description: "Show ponytail measured impact as a scoreboard: less code, less cost, more speed, from the benchmark medians. One-shot display."
+homepage: https://github.com/DietrichGebert/ponytail
+license: MIT
+---
+
+# Ponytail Gain
+
+Display this scoreboard when invoked. One-shot: do NOT change mode, write flag
+files, or persist anything.
+
+The figures are the published benchmark medians (5 everyday tasks: email
+validator, debounce, CSV sum, countdown timer, rate limiter; three models:
+Haiku, Sonnet, Opus). They are measured, not computed from the current repo.
+Source: `benchmarks/` and the README.
+
+## Scoreboard
+
+Render plain ASCII bars. The bar length shows the measured range; the label
+carries the exact figure:
+
+```
+  ponytail gain                     benchmark median · 5 tasks · 3 models
+
+  Lines of code   no-skill  ████████████████████  100%
+                  ponytail  ██▌·················    6–20%   ▼ 80–94%
+  Cost            no-skill  ████████████████████  100%
+                  ponytail  █████▌··············   23–53%  ▼ 47–77%
+  Speed           ponytail  ▸ 3–6× faster
+
+  This repo:  /ponytail-debt  (shortcuts you deferred)
+              /ponytail-audit (what's still cuttable)
+```
+
+## Honesty boundary
+
+These are benchmark medians, not this repo. NEVER print a per-repo savings
+number ("you saved X lines/tokens here"): the unbuilt version was never
+written, so there is no real baseline to subtract from in a live repo. The
+only real per-repo figures come from `/ponytail-debt` (a counted ledger), and
+this card points there instead of inventing one.
+
+## Boundaries
+
+One-shot display. Edits nothing, changes no mode.
+"stop ponytail" or "normal mode": revert.