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/references/README.md

@@ -0,0 +1,31 @@
+# references/
+
+Additional documentation agents load on demand. Files here extend SKILL.md
+without bloating its core context.
+
+## When to add a reference file
+
+Move content here when SKILL.md is approaching 500 lines, or when a topic
+is only relevant in specific circumstances (error handling, edge cases,
+domain-specific sub-procedures).
+
+## How to reference from SKILL.md
+
+Load conditionally — tell the agent exactly when to read each file:
+
+```markdown
+If the API returns a non-200 status, read `references/api-errors.md`.
+```
+
+Avoid generic "see references/ for details" — the agent loads context on
+demand, so give it a precise trigger condition.
+
+## File conventions
+
+- One topic per file — focused files mean less unnecessary context loaded
+- Kebab-case filenames (e.g. `api-errors.md`, `output-formats.md`)
+- Keep files under 200 lines where possible
+
+## If no reference files are needed
+
+Delete this README and the `references/` directory entirely.