fix(kyberforge): resolve agent-author audit findings

Corrects three FAIL findings from the skill-audit run:
- Scope detection table in SKILL.md and references/scripts.md now lists all
  four plugin-marker variants the script actually checks (plugin.json,
  .claude-plugin/plugin.json, .plugin/plugin.json, .github/plugin/plugin.json)
- assets/README.md copilot.agent.md description was wrong about field set;
  replaced with accurate CLI-format description noting excluded cloud/IDE fields
  and the Copilot tool aliases actually used.

Also applies the SUGGESTION: moves the conditional reference
(`If the destination is a plugin directory, read references/deployment-modes.md`)
out of the ## Gotchas section body and into ## Route as a standalone line,
immediately after ## Gotchas closes.

INFO findings (source_keys frontmatter) were already present in both
references/README.md and references/scripts.md — no change needed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0147vXtL5sP6vorDdqXGJJU9

plugins/kyberforge/.claude-plugin/plugin.json

@@ -8,5 +8,5 @@
   "keywords": [],
   "license": "MIT",
   "name": "kyberforge",
-  "version": "1.1.2"
+  "version": "1.1.3"
 }