ci: add migration lint workflow

[loganlanou]

Summary

• Add a pull_request-only migration lint workflow scoped to changes under migrations/.
• Add warning-only SQLFluff linting for modified SQLite migration files.
• Add a blocking SQLite migration-validity job that applies all goose migrations to a temp database.

Validation

• YAML parsed with Ruby and passed actionlint, ignoring existing custom self-hosted runner labels.
• Local SQLFluff baseline over existing migrations: 133 findings; CI lint is warning-only initially.
• Local goose replay against a temp SQLite database passed through version 5.

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Project	Deployment	Actions	Updated (UTC)
rowe-tech	Ready	Preview, Comment	Jun 11, 2026 9:51pm