chore(skills): drop find-skills — unused, and its update step began timing out

RC fix (soak day 1): `make update` step 7.5 failed on a 300s clone timeout
of alchaincyf/find-skills. The skill (search the skills.sh registry from
Claude) was never used; the discovery case stays reachable manually via
`npx -y skills find <query>`. Removed from install-plugins.sh (install list
+ summary + comment), update-all.sh (refresh list), link.sh
(NPX_EXTERNAL_SKILLS), lib/toggle-external.sh (MANAGED_TOOLS + case arms),
plugin-advisor.md, .gitignore; local skills/find-skills symlink deleted.
Memory-registry and test-fixture mentions kept — append-only history.
toggle-external `list` verified post-removal; suites 8/8.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XpphkdTosUzokBDNG7PToS

lib/toggle-external.sh

@@ -20,7 +20,6 @@
 #   gstack            — per-skill symlinks populated by gstack's own setup
 #   emil-design-eng   — single symlink → skills-external/emil-design-eng
 #   darwin-skill      — single symlink → ~/.agents/skills/darwin-skill
-#   find-skills       — single symlink → ~/.agents/skills/find-skills
 #   magic             — 21st-dev Magic MCP server (API key in .env)
 #
 # For fine-grained activation (only design skills, only qa skills, only
@@ -41,7 +40,7 @@ warn() { echo -e "${YELLOW}⚠${NC}  $1"; }
 err()  { echo -e "${RED}✗${NC} $1"; }
 
 # All non-plugin tools this script can toggle.
-MANAGED_TOOLS=(gstack emil-design-eng darwin-skill find-skills magic)
+MANAGED_TOOLS=(gstack emil-design-eng darwin-skill magic)
 
 # Load MAGIC_API_KEY (and any other secrets) from $REPO/.env if present.
 # Called only by the magic branch — other tools don't need env vars.
@@ -81,7 +80,7 @@ status_tool() {
       [ -d "$REPO/skills-external/emil-design-eng" ] || { echo "missing"; return; }
       [ -e "$SKILLS_DIR/emil-design-eng" ] && echo "enabled" || echo "disabled"
       ;;
-    darwin-skill|find-skills)
+    darwin-skill)
       [ -d "$HOME/.agents/skills/$tool" ] || { echo "missing"; return; }
       [ -e "$SKILLS_DIR/$tool" ] && echo "enabled" || echo "disabled"
       ;;
@@ -116,7 +115,7 @@ disable_tool() {
       done < <(gstack_skills)
       ok "gstack disabled ($moved symlinks moved)"
       ;;
-    emil-design-eng|darwin-skill|find-skills)
+    emil-design-eng|darwin-skill)
       if [ -e "$SKILLS_DIR/$tool" ]; then
         rm -rf "${DISABLED_DIR:?}/${tool:?}"
         mv "$SKILLS_DIR/$tool" "$DISABLED_DIR/$tool"
@@ -158,11 +157,11 @@ enable_tool() {
         ok "gstack enabled ($moved symlinks restored)"
       fi
       ;;
-    emil-design-eng|darwin-skill|find-skills)
+    emil-design-eng|darwin-skill)
       local src
       case "$tool" in
         emil-design-eng) src="$REPO/skills-external/$tool" ;;
-        darwin-skill|find-skills) src="$HOME/.agents/skills/$tool" ;;
+        darwin-skill) src="$HOME/.agents/skills/$tool" ;;
       esac
       if [ -e "$DISABLED_DIR/$tool" ]; then
         rm -rf "${SKILLS_DIR:?}/${tool:?}"