fix: remove ShellCheck and checkpoint checks from reusable validate.yml

ShellCheck and checkpoint verification are tools that skills provide for
use on projects, not checks that should run on skill repos themselves.
For example, typo3-testing-skill's checkpoints.yaml validates TYPO3
project structure (Build/UnitTests.xml, Tests/Unit/) which doesn't
exist in the skill repo.

These checks remain available in repo-specific workflows where
appropriate (e.g. agent-rules-skill's validate-agents.yml).

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "skill-repo",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "description": "Guide for structuring Netresearch skill repositories",
   "repository": "https://github.com/netresearch/skill-repo-skill",
   "license": "MIT",

.github/workflows/validate.yml

@@ -29,109 +29,3 @@ jobs:
 
       - name: Run skill validation
         run: bash .skill-repo-tools/skills/skill-repo/scripts/validate-skill.sh .
-
-      - name: ShellCheck scripts
-        run: |
-          # Auto-discover shell scripts in skill directories and root scripts/
-          SCRIPTS=$(find . -path './.skill-repo-tools' -prune -o -path './.git' -prune -o \
-            \( -name '*.sh' -type f -print \) | sort)
-          if [[ -z "$SCRIPTS" ]]; then
-            echo "No shell scripts found, skipping ShellCheck"
-            exit 0
-          fi
-          COUNT=$(echo "$SCRIPTS" | wc -l)
-          echo "Found $COUNT shell script(s)"
-          sudo apt-get update -qq > /dev/null 2>&1 && sudo apt-get install -y -qq shellcheck > /dev/null 2>&1
-          FAILED=0
-          while IFS= read -r script; do
-            [[ -z "$script" ]] && continue
-            echo "Checking: $script"
-            if ! shellcheck -x -S error "$script"; then
-              FAILED=1
-            fi
-          done <<< "$SCRIPTS"
-          if [[ $FAILED -eq 1 ]]; then
-            echo "::error::ShellCheck found errors"
-            exit 1
-          fi
-          echo "All $COUNT scripts passed ShellCheck"
-
-      - name: Verify checkpoints
-        run: |
-          # Find checkpoints.yaml in skill directories
-          CHECKPOINT_FILES=$(find . -path './.skill-repo-tools' -prune -o -path './.git' -prune -o \
-            -name 'checkpoints.yaml' -print | sort)
-          if [[ -z "$CHECKPOINT_FILES" ]]; then
-            echo "No checkpoints.yaml found, skipping"
-            exit 0
-          fi
-          # Install yq
-          sudo wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/download/v4.52.2/yq_linux_amd64 2>/dev/null
-          sudo chmod +x /usr/local/bin/yq
-
-          ERROR_FILE=$(mktemp)
-          trap 'rm -f "$ERROR_FILE"' EXIT
-
-          while IFS= read -r checkpoints_file; do
-            [[ -z "$checkpoints_file" ]] && continue
-            echo "=== Processing $checkpoints_file ==="
-
-            while read -r checkpoint; do
-              id=$(echo "$checkpoint" | jq -r '.id')
-              type=$(echo "$checkpoint" | jq -r '.type')
-              target=$(echo "$checkpoint" | jq -r '.target')
-              pattern=$(echo "$checkpoint" | jq -r '.pattern // empty')
-              severity=$(echo "$checkpoint" | jq -r '.severity')
-              desc=$(echo "$checkpoint" | jq -r '.desc')
-
-              if [[ ! -f "$target" ]]; then
-                if [[ "$severity" == "error" ]]; then
-                  echo "::error::[$id] $desc (file not found: $target)"
-                  echo "1" > "$ERROR_FILE"
-                fi
-                continue
-              fi
-
-              case "$type" in
-                "file_exists")
-                  if [[ -f "$target" ]]; then
-                    echo "OK: [$id] $desc"
-                  else
-                    echo "::error::[$id] $desc"
-                    [[ "$severity" == "error" ]] && echo "1" > "$ERROR_FILE"
-                  fi
-                  ;;
-                "regex")
-                  if grep -qE "$pattern" "$target" 2>/dev/null; then
-                    echo "OK: [$id] $desc"
-                  else
-                    if [[ "$severity" == "error" ]]; then
-                      echo "::error::[$id] $desc"
-                      echo "1" > "$ERROR_FILE"
-                    else
-                      echo "WARNING: [$id] $desc"
-                    fi
-                  fi
-                  ;;
-                "regex_not")
-                  if grep -qE "$pattern" "$target" 2>/dev/null; then
-                    if [[ "$severity" == "error" ]]; then
-                      echo "::error::[$id] $desc"
-                      grep -nE "$pattern" "$target" | head -3
-                      echo "1" > "$ERROR_FILE"
-                    else
-                      echo "WARNING: [$id] $desc"
-                    fi
-                  else
-                    echo "OK: [$id] $desc"
-                  fi
-                  ;;
-              esac
-            done < <(yq e '.mechanical[]' "$checkpoints_file" -o=json | jq -c '.')
-          done <<< "$CHECKPOINT_FILES"
-
-          if [[ -s "$ERROR_FILE" ]]; then
-            echo "::error::Some checkpoints failed"
-            exit 1
-          fi
-          echo "All checkpoints passed"