feat(openapi): add operation frontmatter to generated messages

[boyney123]

Summary

• Adds operation frontmatter (method, path, statusCodes) to OpenAPI-generated messages (commands, queries, events)
• Status codes are extracted from response definitions, excluding default responses
• Operation frontmatter is always overridden from the OpenAPI spec on regeneration (not persisted from existing messages)

Test plan

• Tests for POST, GET, PUT, DELETE operations
• Test that statusCodes excludes default response code
• Test that operation frontmatter is overridden on regeneration
• Test for event messages with operation frontmatter

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: c1e9721

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@eventcatalog/generator-openapi	Minor
@eventcatalog/generator-apicurio	Major

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