refactor: export MIGRATION_COUNT from runner to replace hardcoded test assertions

[MattieTK]

What does this PR do?

Extracts the migrations map from inside StaticMigrationProvider.getMigrations() to a module-level const, and exports a MIGRATION_COUNT derived from Object.keys(). The three migration test files now import MIGRATION_COUNT instead of hardcoding the number.

Before, every new migration required updating 5 separate toHaveLength(N) calls across 3 files. Now it requires no test changes at all — the count is always derived from the source of truth.

Type of change

• Bug fix
• Feature (requires approved Discussion)
• Refactor (no behavior change)
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm --silent lint:json | jq '.diagnostics | length' returns 0
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code

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Latest commit: ded9146

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Status	Name	Latest Commit	Updated (UTC)
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commit: ded9146

[Copilot]

Pull request overview

Refactors the core database migration runner to centralize the migration registry and exposes a derived migration count so tests no longer hardcode the expected number of migrations.

Changes:

• Hoists the static migrations map in runner.ts to a module-level constant and exports MIGRATION_COUNT.
• Updates migration-related tests to assert against MIGRATION_COUNT instead of hardcoded lengths.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/core/src/database/migrations/runner.ts	Introduces module-level MIGRATIONS and exports MIGRATION_COUNT; StaticMigrationProvider now returns the shared map.
packages/core/tests/integration/database/migrations.test.ts	Replaces hardcoded migration record counts with MIGRATION_COUNT.
packages/core/tests/integration/database/dialect-compat.test.ts	Replaces hardcoded migration record counts with MIGRATION_COUNT across dialect tests.
packages/core/tests/database/migrations.test.ts	Replaces hardcoded applied/record counts with MIGRATION_COUNT.

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Overlapping PRs

This PR modifies files that are also changed by other open PRs:

• perf(db): add published_at composite index for frontend listing queries #333 (4 shared files)
• fix: content type form validation, URL pattern defaults, and label uniqueness #254 (4 shared files)

This may cause merge conflicts or duplicated work. A maintainer will coordinate.