fix(ids): match patterns against the whole value and apply every length limit

[helenkwok]

Description

Fixes #815.

• pattern: the regular expression is wrapped as ^(?:…)$, so it matches the whole value as an XSD pattern does.
• length: length, min and max must all hold, instead of the last one checked deciding.

Additional context

• New facets/facet.test.ts tests evalRequirement through a minimal facet (no model needed): whole-value pattern matching, alternation (A|B rejects AB), and the combined length limits. Both tests fail without the change.
• vitest --run in packages/core: all pass. tsc -p tsconfig-build.json --noEmit is clean.
• XSD regular expressions have a few constructs JavaScript doesn't (\i, \c, character class subtraction). This PR doesn't translate those; it only fixes the anchoring.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following:

• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Follow the Conventional Commits v1.0.0 standard for PR naming (e.g. feat(examples): add hello-world example).
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.