fix(kyberforge): fix template test docs, dangling skill ref, and README table consistency

- Rewrite assets/templates/tests/README.md with correct repo-root context and
  SKILL_NAME placeholder in bats run command (was: `bats tests/`, wrong CWD)
- Add sed substitution for tests/README.md in new-skill.sh so SKILL_NAME is
  replaced in scaffolded test docs; test added to new-skill.bats (red→green)
- Remove /write-eval reference from skill-improve SKILL.md; reword as direct
  action since the skill does not exist in the kyberforge plugin
- Remove self-referential README.md rows from skill-audit and skill-improve
  Files tables to match template and skill-write convention

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

plugins/kyberforge/skills/skill-write/tests/new-skill.bats

@@ -59,6 +59,12 @@ teardown() {
     assert_success
 }
 
+@test "substitutes skill name in tests/README.md" {
+    bash "$SCRIPT" my-tool "$DEST"
+    run grep "my-tool" "$DEST/my-tool/tests/README.md"
+    assert_success
+}
+
 @test "skill name with numbers is valid" {
     run bash "$SCRIPT" my-tool-2 "$DEST"
     assert_success