[blueDaydreaming725]

Fixes #899.

XML's epilog permits whitespace, comments, and processing instructions, but not character references, CDATA, DOCTYPE, or another root element. The validator's text-scanning loop handled references and markup before applying its existing reachedRoot check. Self-closing roots also never marked that state.

This change rejects references and non-comment <!...> markup after the root, records when a self-closing root completes, and applies the existing multiple-root error to a following self-closing element. Valid epilog content and the same constructs inside the root remain supported.

Validation

Node 24.22.1 on macOS:

• Added validator and validation-enabled parser regressions for paired and self-closing roots. The invalid cases pass incorrectly before the fix and are rejected afterward; comments, processing instructions, and whitespace remain valid.
• npx jasmine spec/validator_spec.js — 68 specs, 0 failures.
• npm test — 343 specs, 0 failures, 2 existing pending specs.
• npm run test-types and npm run bundle pass.
• The generated CJS bundle was exercised against all four invalid epilog forms and valid controls. Generated files are not included in this PR, matching recent source-only contributions.
• npm run lint cannot start because its script references the absent benchmark/**/*.js path. A broader direct ESLint invocation also reports existing errors; neither is claimed as a passing lint check.