fix: ignore generated migration manifests in templates

[ascorbic]

What does this PR do?

Ignores the generated .emdash/migrations.json manifest in all nine shipped templates so an Astro build does not leave a new site with an untracked file. Documents the same rule for existing sites and updates the existing deployment migration changeset while preserving its association with #2437.

Follow-up to #2437.

Type of change

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

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable). Do not include messages.po changes except in translation PRs — a workflow extracts catalogs on merge to main.
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: not applicable; this is a bug fix

No new test file is needed for static ignore metadata. A targeted check verifies that every shipped template ignores .emdash/migrations.json exactly once. The change has no admin UI strings.

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Codex (GPT-5)

Screenshots / test output

Not applicable; this change has no visual output.

• pnpm typecheck
• pnpm typecheck:templates
• pnpm lint
• pnpm format
• pnpm --dir docs build
• Template coverage check: 9/9
• Changeset origin check: Add deployment-managed core migration primitives #2437

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8c77fed

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes changesets to release 17 packages

Name	Type
emdash	Minor
@emdash-cms/cloudflare	Minor
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	Major
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/do-demo-site	Patch
@emdash-cms/do-solo-demo-site	Patch
@emdash-cms/admin	Minor
@emdash-cms/auth	Minor
@emdash-cms/blocks	Minor
@emdash-cms/gutenberg-to-portable-text	Minor
@emdash-cms/x402	Minor
create-emdash	Minor
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

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Click here if you're a maintainer who wants to add a changeset to this PR

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