Add ID scheme validator and profile selection

[HassanAkbar]

Finishes the ISO/IEC usage profile layer — the last 4 boxes in TODO.sts-refactor/08-isoiec-profile.md.

A profile is a constraint layer over NISO STS, not a schema, so this adds no model classes and parsing is unchanged.

doc = Sts::NisoSts::Standard.from_xml(xml)
Sts::Profiles.validator(:iso_iec).validate(doc)
Sts::Profiles.validator(:iso_iec, id_scheme: :iso).validate(doc)

Adds the profile entry point, an opt-in ID scheme check for ISO and IEC, committee reference patterns for both, and a README section covering all of it.

The ID check is off by default. Annex F calls OSD ids arbitrary and warns against relying on them, and real documents agree — ISO_13849-1_2008-12_en_TBX.xml matches the IEC scheme for figures and tables but uses sub- for sections. Elements outside the scheme table are never checked.

Ids are read back off the serialized document, so annexes and refs inside ref-list are covered. Walking the model accessors by hand would miss them.

lib/sts.rb now requires Moxml explicitly. lutaml-model already loaded it, but naming a constant you only get transitively breaks on the next dependency bump.

Additive only. Existing Validator.new callers keep working.

bundle exec rspec: 5231 examples, 0 failures. bundle exec rubocop: clean. spec/anti_patterns_spec.rb passes.

Metanorma PR checklist

• Breaking changes (list related PRs)
• Documentation update required (create task for this)
• External dependency introduced (documentation update need)
• Gem with native library introduced

[Copilot]

Pull request overview

This PR completes the ISO/IEC usage profile layer for NISO STS by adding a public profile entry point, implementing an optional semantic ID scheme validator (ISO vs IEC), and documenting usage. It keeps parsing unchanged by validating already-parsed Sts::NisoSts::Standard documents.

Changes:

• Add Sts::Profiles.validator(:iso_iec, id_scheme: ...) entry point with UnknownProfileError for unknown profiles.
• Implement opt-in ISO/IEC semantic ID scheme checking by re-reading IDs from serialized XML.
• Add specs + README documentation for profile validation and ID scheme behavior; update anti-pattern allowlist to permit explicit require "moxml".

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
TODO.sts-refactor/08-isoiec-profile.md	Marks ISO/IEC profile layer checklist items as completed.
spec/profiles/profiles_spec.rb	Exercises Sts::Profiles.validator profile selection and id_scheme argument validation.
spec/profiles/iso_iec_validator_spec.rb	Adds coverage for validator behavior with id_scheme enabled and updates constraints expectations.
spec/profiles/id_scheme_spec.rb	Unit + fixture-based conformance tests for ISO/IEC ID scheme prefixes.
spec/anti_patterns_spec.rb	Allows require "moxml" as an external dependency in lib/.
README.adoc	Documents ISO/IEC usage profile validation and optional semantic ID scheme checking.
lib/sts/profiles/iso_iec/validator.rb	Adds opt-in ID scheme validation by extracting IDs from serialized XML.
lib/sts/profiles/iso_iec/id_scheme.rb	Introduces IdScheme for ISO/IEC per-element ID prefix validation.
lib/sts/profiles/iso_iec/constraints.rb	Updates constraint constants and adds committee reference examples.
lib/sts/profiles/iso_iec.rb	Autoloads the new IdScheme implementation.
lib/sts/profiles.rb	Adds Sts::Profiles.validator entry point and UnknownProfileError.
lib/sts.rb	Explicitly requires moxml to avoid relying on transitive dependencies.
.rubocop_todo.yml	Excludes new profile specs from RSpec/SpecFilePathFormat cop.

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[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

README.adoc:212

• This sentence implies <std-meta>/<std-ident> are always checked, but the current validator only validates metadata when <std-ident> is present (missing <std-ident> does not currently produce an error). Update the wording to match the implementation (or alternatively enforce presence in the validator).

`validate` returns an array of message strings, empty when the document satisfies the profile. It checks document structure and `<std-meta>`/`<std-ident>` metadata. The validator targets NISO STS documents (`Sts::NisoSts::Standard`).