feat(kyberforge): replace write-skill with spec-compliant skill-write and add skill-audit

Rewrote the skill authoring factory skill from scratch against the agentskills.io
specification. Renamed write-skill → skill-write (name now matches directory per spec).

skill-write:
- Full scaffold via new-skill.sh (annotated templates for SKILL.md, README.md,
  scripts/, references/, assets/)
- validate.sh checks all spec constraints deterministically (name format/length,
  description length, placeholder detection, line count, script rules)
- SKILL.md body includes description rules, body discipline, patterns, and scripts
  guidance with "why" rationale throughout
- Templates usable standalone by agents and humans

skill-audit:
- Structural validation (via validate.sh) + seven qualitative dimensions
- Produces PASS/FAIL/SUGGESTION punch list with per-FAIL fix proposals
- Report-only: does not apply fixes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/kyberforge/skills/skill-write/scripts/new-skill.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SKILL_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+TEMPLATES_DIR="$SKILL_DIR/../assets/templates"
+
+usage() {
+  cat <<EOF
+Usage: new-skill.sh <skill-name> <destination-dir>
+
+Create a new skill scaffold by copying annotated templates to the destination.
+
+Arguments:
+  skill-name       Kebab-case skill identifier (e.g. my-tool, data-analyzer).
+                   Must match the directory name exactly.
+  destination-dir  Parent directory to create the skill in.
+                   Examples: ~/.agents/skills/  plugins/myplugin/skills/
+
+Output:
+  Creates <destination-dir>/<skill-name>/ with annotated templates ready to fill in.
+
+Exit codes:
+  0  Scaffold created successfully
+  1  Invalid arguments or destination already exists
+EOF
+}
+
+if [[ "${1:-}" == "--help" || "${1:-}" == "-h" ]]; then
+  usage
+  exit 0
+fi
+
+if [[ $# -lt 2 ]]; then
+  echo "Error: skill-name and destination-dir are required." >&2
+  echo "" >&2
+  usage >&2
+  exit 1
+fi
+
+SKILL_NAME="$1"
+DEST_DIR="$2"
+
+# Validate skill name format
+if ! echo "$SKILL_NAME" | grep -qE '^[a-z0-9]+(-[a-z0-9]+)*$'; then
+  echo "Error: skill-name must use lowercase letters, numbers, and hyphens only." >&2
+  echo "       No leading, trailing, or consecutive hyphens." >&2
+  echo "       Received: '$SKILL_NAME'" >&2
+  exit 1
+fi
+
+# Validate templates directory exists
+if [[ ! -d "$TEMPLATES_DIR" ]]; then
+  echo "Error: templates directory not found at '$TEMPLATES_DIR'." >&2
+  echo "       Run this script from its original location inside the skill-write skill." >&2
+  exit 1
+fi
+
+# Validate destination exists
+if [[ ! -d "$DEST_DIR" ]]; then
+  echo "Error: destination directory '$DEST_DIR' does not exist." >&2
+  exit 1
+fi
+
+TARGET="$DEST_DIR/$SKILL_NAME"
+
+# Refuse to overwrite existing directory
+if [[ -d "$TARGET" ]]; then
+  echo "Error: '$TARGET' already exists." >&2
+  echo "       Remove it first or choose a different name." >&2
+  exit 1
+fi
+
+# Copy templates to destination
+cp -r "$TEMPLATES_DIR" "$TARGET"
+
+# Set skill name in templates
+sed -i "s/SKILL_NAME/$SKILL_NAME/g" "$TARGET/SKILL.md"
+sed -i "s/SKILL_NAME/$SKILL_NAME/g" "$TARGET/README.md"
+
+echo "Scaffold created: $TARGET"
+echo ""
+echo "Next steps:"
+echo "  1. Fill in $TARGET/SKILL.md — replace all FILL IN: placeholders"
+echo "  2. Add scripts to scripts/ if needed (or delete the directory)"
+echo "  3. Add docs to references/ if needed (or delete the directory)"
+echo "  4. Add resources to assets/ if needed (or delete the directory)"
+echo "  5. Validate: bash $(dirname "${BASH_SOURCE[0]}")/validate.sh $TARGET"