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/README.md

@@ -0,0 +1,63 @@
+# skill-write
+
+Author a new skill conforming to the [agentskills.io](https://agentskills.io) specification.
+
+## What it does
+
+1. Scaffolds a full skill directory from annotated templates
+2. Guides filling in `SKILL.md` and supporting files
+3. Validates the result against the spec
+
+## Before you start
+
+This skill produces its best output when you arrive with rich context:
+
+- Run `/grill-me` to resolve design decisions (scope, triggers, patterns)
+- Collect domain research, examples, and reference docs
+- Know the skill name (kebab-case) and destination path
+
+## Usage
+
+Invoke via your agent tool with `/skill-write`, or follow the steps in `SKILL.md` manually.
+
+**Agent invocation:**
+```
+/skill-write
+```
+
+**Manual (human) workflow:**
+```bash
+# 1. Create the scaffold
+bash scripts/new-skill.sh <skill-name> <destination-dir>
+
+# 2. Fill in the templates at <destination-dir>/<skill-name>/
+
+# 3. Validate
+bash scripts/validate.sh <destination-dir>/<skill-name>
+```
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `SKILL.md` | Skill instructions for agents |
+| `scripts/new-skill.sh` | Copies annotated templates to the destination |
+| `scripts/validate.sh` | Validates a skill directory against the spec |
+| `assets/templates/SKILL.md` | Annotated SKILL.md template |
+| `assets/templates/README.md` | Annotated README template for the new skill |
+| `assets/templates/scripts/README.md` | Placeholder for bundled scripts |
+| `assets/templates/references/README.md` | Placeholder for reference docs |
+| `assets/templates/assets/README.md` | Placeholder for static assets |
+
+## Placement
+
+Skills can be installed in two locations:
+
+| Type | Path |
+|------|------|
+| Direct (available immediately) | `~/.agents/skills/<name>/` |
+| Plugin (installed via marketplace) | `plugins/<plugin>/skills/<name>/` |
+
+## Spec reference
+
+[agentskills.io specification](https://agentskills.io/specification.md)