Fix boolean pattern metrics after reload

[SH1RLEYyang]

No description provided.

[Copilot]

🟢 Approval recommended

The change is narrowly scoped, schema-driven, and covered by a targeted round-trip test that demonstrates the intended behavior.

Pull request overview

This PR fixes a type regression in MMEAF deserialization where pattern slot metric values (stored as XML attributes) were always decoded as strings after reload, causing boolean metrics (checkboxes) to come back as "true"/"false" instead of true/false.

Changes:

• Add schema-aware decoding for mm:metric_value entries so boolean metrics are parsed as booleans based on their metric schema.
• Build a metricTypes lookup map from parsed pattern schemas and reuse it when parsing patterns and pattern-related suggestions.
• Add a round-trip test ensuring boolean metric values are restored as booleans while text metrics remain strings.

File summaries

File	Description
packages/serialization/src/mmeaf-parse.ts	Decode mm:metric_value attributes using the metric schema type (boolean vs string).
packages/serialization/tests/mmeaf-roundtrip.test.ts	Add coverage proving boolean metrics survive emit→parse as booleans (and text "true" stays a string).

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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