feat(#566): add invalid-name-notation lint

[VasilevNStas]

fix #566

New lint invalid-name-notation checks that every @name in the XMIR matches [a-z]+(-[a-z]+)* — kebab-case, Latin letters only, no digits/underscores/uppercase, as requested in #566.

• src/main/resources/org/eolang/lints/names/invalid-name-notation.xsl — the lint (warning severity, same defect shape as non-kebab-name).
• src/main/resources/org/eolang/motives/names/invalid-name-notation.md — motive.
• eo:special now also recognizes ξ (xi), an internal parser symbol alongside φ/λ; otherwise parser-generated <o name="ξ"/> inside atoms would be flagged.
• 4 YAML packs: allows-good-names, allows-special-names (incl. φ, λ, a🌵N-N auto-names and test names), allows-throwing-test-name, catches-invalid-names.
• canonical.eo: renamed the [i1] lambda parameter to [i] in canonical.eo — digits are now forbidden by design (confirmed by @yegor256 in invalid-name-notation Lint for @name Attribute Matching Not Created #566).

Verified: mvn clean install -Pqulice green (404 LtByXslTest + all suites), mvn jmh:benchmark passed.

[volodya-lombrozo]

Thanks for the contribution! These commits aren't GPG/SSH-signed, and rultor requires signed commits to merge — see GitHub's guide on signing commits: https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits. Closing for now; please feel free to reopen once your commits are signed.

[VasilevNStas]

@volodya-lombrozo, fixed — commits are now SSH-signed (verified by GitHub). Since the closed PR can't be reopened after a force-push, I've recreated it as #1235 (same change, signed commits).