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/assets/templates/assets/README.md

@@ -0,0 +1,29 @@
+# assets/
+
+Static resources bundled with this skill: templates, schemas, lookup tables,
+sample data, images.
+
+## When to add an asset
+
+Add a file here when the skill needs a static resource that:
+- Would be tedious to reproduce in instructions (a full JSON schema, a CSV
+  lookup table, a binary template)
+- Needs to be referenced by path rather than inlined in SKILL.md
+
+## How to reference from SKILL.md
+
+Use a relative path from the skill root:
+
+```markdown
+Use the schema at `assets/response-schema.json` to validate output.
+```
+
+Or instruct the agent to load it conditionally:
+
+```markdown
+If validating output format, use `assets/response-schema.json`.
+```
+
+## If no assets are needed
+
+Delete this README and the `assets/` directory entirely.