improve XLS validator

[mvadari]

High Level Overview of Change

This PR improves the XLS validator to better catch non-compliant specs.

Checking XLS headers is now cleaner and DRY-er, lots of code cleanup (removing unused variables etc) as well.

Context of Change

It didn't flag on #451 when it should have

Type of Change

• Infrastructure (CI, workflows, scripts, website)

[Copilot]

Pull request overview

This PR tightens XLS validation to catch more non-compliant specs (notably cases like #451), by centralizing and expanding preamble metadata validation and strengthening Amendment template enforcement.

Changes:

• Added shared preamble validation (validate_xls_preamble) with stricter required fields, enums, and date-format checks.
• Updated the template validator to reuse shared preamble validation and added heuristics to detect “existing XRPL primitive” sections that should use Amendment template headings.
• Updated several existing XLS READMEs to comply with the stricter metadata requirements (status, description, withdrawal reason, etc.).

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/xls_parser.py	Introduces shared preamble validation and uses it during full-repo XLS parsing validation.
scripts/validate_xls_template.py	Reuses shared preamble validation; adds stricter structure checks and heuristic enforcement for legacy-style Amendment specs.
XLS-0101-smart-contracts/README.md	Adjusts status to comply with allowed status values.
XLS-0051-nftoken-escrow/README.md	Adds required description metadata and reorganizes preamble fields.
XLS-0017-xfl/README.md	Fixes misspelled description metadata key.
XLS-0016-nft-metadata/README.md	Normalizes metadata formatting and adds required description.
XLS-0015-concise-tx-id/README.md	Adds required withdrawal-reason for Withdrawn status.
XLS-0010-non-transferable-tokens/README.md	Adds required description metadata.
XLS-0008-tickets/README.md	Adds required withdrawal-reason for Withdrawn status.

Comments suppressed due to low confidence (2)

scripts/validate_xls_template.py:193

• The section-number stripping regex only matches single-level numbering like 1. Title. Many specs use nested numbering (e.g. 1.1. Abstract), which will prevent required-section checks like "Abstract" not in section_titles from working and can yield false validation errors. Consider updating the regex to strip \d+(\.\d+)*. prefixes (or relaxing required-section matching to use substring checks).

    def _parse_sections(self):
        """Parse all sections from the markdown content using markdown-it-py."""

scripts/validate_xls_template.py:658

• 'except' clause does nothing but pass and there is no explanatory comment.

    print("Validation complete:")

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[mvadari]

The template checker is expected to fail here