fix(kyberforge): resolve plugin-create path bug, validate.sh false positives, and write-skill YAML error

- plugin-create/SKILL.md: fix ${CLAUDE_PLUGIN_ROOT} path (create-plugin → plugin-create, 4 occurrences)
- plugin-create/SKILL.md: delegate reserved name validation to new references/reserved-names.md (complete list)
- plugin-create/SKILL.md: add displayName reminder in step 4, full-validation pointer in step 7
- plugin-create/references/reserved-names.md: complete reserved name list extracted from claude-code.md
- plugin-create/references/manifest-fields.md: quick-ref for both plugin.json manifests and marketplace entry
- plugin-create/META.md: update stale when: and references: fields to reflect post-migration paths
- plugin-create/assets/plugin-template/hooks.json: unify empty hooks schema to {} (was [])
- write-skill/SKILL.md: fix YAML frontmatter parse error — wrap description in >- block scalar
- validate.sh: strip backtick spans before ../  check to eliminate documentation false positives
- inventory.sh: same backtick-span fix, applied to both outer check and per-line reporting
- tests/test_scripts.sh: fix SCRIPTS_DIR path to skills/marketplace-architect/scripts/

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

plugins/kyberforge/skills/write-skill/SKILL.md

@@ -1,6 +1,12 @@
 ---
 name: write-skill
-description: Use when the user wants to author a new skill file or convert an existing placeholder to the canonical authoring standard. Triggers: "write a new skill for X", "create a SKILL.md that does Y", "build a skill to handle Z". Do NOT use when fixing or updating an existing well-formed skill (use upgrade-skill), running existing evals (use write-eval), refactoring application code, or writing documentation for non-skill artifacts.
+description: >-
+  Use when the user wants to author a new skill file or convert an existing
+  placeholder to the canonical authoring standard. Triggers: "write a new skill
+  for X", "create a SKILL.md that does Y", "build a skill to handle Z". Do NOT
+  use when fixing or updating an existing well-formed skill (use upgrade-skill),
+  running existing evals (use write-eval), refactoring application code, or
+  writing documentation for non-skill artifacts.
 metadata:
   category: factory
 model: sonnet