docs(0.1.18-postfix): neutral Crossref mailto in MCP docs; catalog note 66/26

[kuker24]

Summary

Docs-only postfix on main following 0.1.18 release:

• Neutral Crossref mailto: In mcp/penulis-ilmiah/.env.example and mcp/penulis-ilmiah/README.md, neutralize personal email example and document fallback to open-code-highend@users.noreply.github.com.
• Catalog freeze note: Update catalog count note in vendor/skill-policy.json to 66 names (51 model, 15 manual; 26 closed intents) and align freeze note in docs/source-wave.md to 66 (post-0.1.18).
• Zero code / runtime / version diff:
  • VERSION unchanged at 0.1.18.
  • Annotated tag v0.1.18 untouched and anchored to 5843d0653fe742a19d25736aaa22f9d0bc650cd1.
  • vendor/skill-allowlist.txt untouched (66 skills).
  • mcp/penulis-ilmiah/src/** untouched.
  • Zero occurrences of personal email in tracked files (git grep exit code 1).

Invariant Verification

• Total tests: all unit tests (python3 -m unittest discover -s tests) PASS.
• Shell test suites: tests/test-install.sh and tests/test-idempotency.sh PASS.
• Fast-forward merge to main only (--ff-only).