feat: add validate-text-file subcommand and fix --strict for unresolvable CURIEs

[github-actions]

Closes #12.

Summary

• New validate-text-file subcommand — validates ontology term CURIEs and labels embedded in a text/markdown file using a regex, without requiring an intermediate LinkML schema.
• New EnumValidator.validate_curie_label_pairs() method — reusable core logic for CURIE+label pair validation independent of a schema.
• Bug fix: --strict now errors on unresolvable CURIEs with unconfigured prefixes — previously these silently passed as INFO; with --strict they are now ERROR. Affects both validate-schema and validate-text-file.

Usage

# Default @term pattern
linkml-term-validator validate-text-file document.md \
  --config oak_config.yaml --strict -v

# Custom regex
linkml-term-validator validate-text-file document.md \
  --regex '@term (\S+) "([^"]*)"' \
  --curie-group 1 --label-group 2 \
  --config oak_config.yaml --strict -v

Example markdown document:

## Validated Identifiers
- @term MONDO:0009282 "multiple acyl-CoA dehydrogenase deficiency"
- @term ORDO:26791 "Multiple acyl-CoA dehydrogenase deficiency"

Behaviour

Situation	Without --strict	With --strict
Label matches ontology	✅ pass	✅ pass
Label mismatch	❌ error	❌ error
CURIE not found, configured prefix	❌ error	❌ error
CURIE not found, unconfigured prefix	✅ skip (INFO)	❌ error

Test plan

• test_validate_text_file_help — help text contains all new flags
• test_validate_text_file_valid_terms — 3 valid terms → exit 0
• test_validate_text_file_label_mismatch — wrong label → exit 1 with mismatch message
• test_validate_text_file_unresolvable_configured_prefix — nonexistent CURIE in configured ontology → exit 1
• test_validate_text_file_unresolvable_unconfigured_no_strict — unconfigured prefix without --strict → exit 0 (skip)
• test_validate_text_file_unresolvable_unconfigured_strict — unconfigured prefix with --strict → exit 1
• test_validate_text_file_custom_regex — custom regex with swapped group order → exit 0
• test_validate_text_file_no_matches — file with no @term lines → exit 0 with warning
• test_validate_text_file_invalid_regex — bad regex → exit 1 with message
• test_validate_text_file_verbose — verbose mode shows each CURIE
• test_validate_schema_strict_unresolvable_unconfigured — --strict fix for validate-schema

All 24 CLI tests pass, along with the full existing test suite (57 tests total).

🤖 Generated with Claude Code