docs(index): recommend install.sh — task install is broken

Verified this session: `task install` (and its sub-targets) wipe/skip the
per-skill symlinks (0/40 across all harnesses), while install.sh wires 40/40
reliably. Point the wiring docs at install.sh until the Taskfile bug is fixed.

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

SKILLS_INDEX.md

@@ -45,9 +45,11 @@ This index lists all available engineering skills. Load the full SKILL.md on dem
 
 ## Wiring into tools
 
-This repo **is** the canonical home. Clone it (e.g. to `~/dev/skills`) and run
+This repo **is** the canonical home. Wire every skill into each harness with the
-`task install` — or the one-shot `curl -fsSL .../install.sh | bash` — to wire
+**`install.sh`** script (idempotent, per-skill symlinks) — either the one-shot
-every skill into each harness. Per-skill symlinks, idempotent:
+`curl -fsSL https://git.d-ma.be/mathias/skills/raw/branch/main/install.sh | bash`,
+or, from a clone, `SKILLS_CHECKOUT_DIR="$PWD" bash install.sh`. (The `task
+install` targets are currently broken — see issue — use `install.sh`.)
 
 - **Claude Code (global)** — `~/.claude/skills/<name>` → `<repo>/<name>`.
 - **Claude Code (per-repo)** — `<repo>/.claude/skills/<name>` when `task install`