feat: ship ponytail to OpenClaw (ClawHub skill package) (#102)

Adds .openclaw/skills/ (ponytail + review/audit/debt/help) generated from the canonical skills/ (verbatim body, no drift), a generator script, and a drift test. Verified live: loads as Ready in OpenClaw 2026.6.6.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -149,6 +149,14 @@ agy plugin install https://github.com/DietrichGebert/ponytail
 
 It reuses this repo's `gemini-extension.json`. One difference: Antigravity converts the `/ponytail` commands into skills, so you type them into the chat (e.g. `/ponytail-review` as a message) instead of picking them from a slash menu. Until the migration completes (around June 18, 2026), `gemini extensions install` still works too. To run it as an always-on rule instead, drop the ruleset into `.agents/rules/`.
 
+### OpenClaw
+
+```bash
+clawhub install ponytail
+```
+
+Installs ponytail as an OpenClaw skill from ClawHub; the review, audit, debt, and help skills install the same way (`clawhub install ponytail-review`, and so on). OpenClaw applies it on coding tasks and also exposes it as a `/ponytail` command. Without ClawHub, copy [`.openclaw/skills/ponytail`](.openclaw/skills/) into `~/.openclaw/skills/`.
+
 That was it. He'd be proud. He won't say it.
 
 Active every session, with a handful of commands (see [Commands](#commands)). `/ponytail ultra` exists for when the codebase has wronged you personally. Startup and mode-change text shows the current mode.
@@ -186,6 +194,8 @@ node scripts/check-rule-copies.js
 npm test
 ```
 
+The OpenClaw skill package (`.openclaw/skills/`) is generated from `skills/`; rerun `node scripts/build-openclaw-skills.js` after changing a skill, the test suite fails if it is stale.
+
 The correctness benchmark spawns Python for email and CSV checks; `python3` is tried before `python`. CSV checks need `pandas` installed locally.
 
 ## FAQ