feat(kyberforge): add skill-author, merging skill-write and skill-improve

Closes #5. Single authoring skill replaces the factory trio — one set of
standards, one script, one place for future governance rules. Routes to
create or improve flow based on context. Passes skill-audit with no findings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016z2ZFYHQCex8yZAMVMTZzZ

plugins/kyberforge/skills/skill-author/assets/templates/SKILL.md

@@ -0,0 +1,101 @@
+---
+# SKILL.md — agentskills.io skill definition
+# Fill in all FILL IN: placeholders. Remove comment blocks that don't apply.
+
+name: SKILL_NAME
+# Required. Must exactly match the parent directory name.
+# Valid characters: lowercase letters, numbers, hyphens.
+# Invalid: uppercase, leading/trailing/consecutive hyphens.
+# Max length: 64 characters.
+# Examples: my-tool, data-analyzer, pdf-processor
+
+description: >
+  FILL IN: What does this skill do? State capabilities specifically
+  (e.g. "parses and validates OpenAPI specs", not "helps with APIs").
+  Use when FILL IN: when should an agent activate this skill?
+  Include indirect triggers: even if the user doesn't mention X explicitly.
+  Do not use when FILL IN: near-miss exclusions — remove this line if none apply.
+
+# license: MIT
+# Optional. License name (e.g. MIT, Apache-2.0) or relative path to a bundled
+# license file. Include when distributing this skill. Omit for private/internal use.
+
+# compatibility: Requires python3 >= 3.10 and uv
+# Optional. 1–500 characters. State tool requirements, runtime versions,
+# and network access needs. Omit for skills with no special environment requirements.
+
+# metadata:
+#   author: your-name
+#   version: "1.0"
+#   category: general
+# Optional. Arbitrary key-value map. Common keys: author, version, category.
+# No restrictions on keys or values.
+
+# allowed-tools: Bash Read Write
+# Optional (experimental — support varies by client).
+# Space-separated list of pre-approved tools.
+# Use when tool usage is known and bounded, to reduce permission prompts.
+---
+
+<!-- ============================================================
+  SKILL BODY
+
+  Include only what the agent lacks:
+    - Domain conventions the agent cannot infer from general knowledge
+    - Non-obvious sequences or ordering constraints
+    - One default per decision point + one escape hatch (never a menu)
+    - Gotchas — facts that defy reasonable assumptions
+
+  Omit:
+    - Concepts the agent already knows
+    - Exhaustive option lists
+    - Steps the agent handles independently
+    - Restatements of the description
+
+  Size budget: under 500 lines / 5000 tokens.
+  Move reference material to references/ and load it conditionally.
+  Bundle repeated executable logic into scripts/.
+
+  Delete this comment block before shipping.
+============================================================ -->
+
+<!-- OPTIONAL: Gotchas section — highest-value content. Place near the top.
+     Add facts that defy reasonable assumptions or non-obvious constraints.
+
+## Gotchas
+
+- FILL IN: fact that defies a reasonable assumption
+- FILL IN: non-obvious naming discrepancy or hidden constraint
+-->
+
+<!-- OPTIONAL: Multi-step workflow checklist.
+
+## Workflow
+
+- [ ] Step 1: FILL IN
+- [ ] Step 2: FILL IN
+- [ ] Step 3: FILL IN
+-->
+
+<!-- OPTIONAL: Output format template — use when the agent must produce a specific format.
+
+## Output format
+
+Use this structure:
+
+```markdown
+# [FILL IN: Title]
+
+## FILL IN: Section
+FILL IN: what goes here
+```
+-->
+
+<!-- OPTIONAL: Conditional reference — load documentation only when needed.
+
+If FILL IN: condition, read `references/FILL IN: filename.md`.
+-->
+
+## FILL IN: <section-name (e.g. Step 1, Workflow, Instructions)>
+
+FILL IN: Add your skill instructions here. Replace this section header and body with your skill content.