chore: add shared skills catalog (19 skills), installers, manifest, validator

install.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+# dsh-skills — shared DeepSeek Harness skills installer (bash/macOS/Linux)
+# Copies/updates the skills catalog into the DSH user skills directory.
+set -euo pipefail
+
+# Resolve target: $1 if given, else $DSH_HOME/skills else ~/.dsh/skills
+TARGET="${1:-}"
+if [ -z "$TARGET" ]; then
+  if [ -n "${DSH_HOME:-}" ]; then TARGET="$DSH_HOME/skills"; else TARGET="$HOME/.dsh/skills"; fi
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SRC="$SCRIPT_DIR/skills"
+
+if [ ! -d "$SRC" ]; then
+  echo "skills/ directory not found at $SRC. Run from a repo clone." >&2
+  exit 1
+fi
+
+mkdir -p "$TARGET"
+
+for dir in "$SRC"/*/; do
+  name="$(basename "$dir")"
+  echo "Syncing skill: $name"
+  rm -rf "$TARGET/$name"
+  cp -R "$dir" "$TARGET/$name"
+done
+
+echo "Done. Skills installed to $TARGET. Restart the agent to refresh the catalog."