fix(cli/export-seed): include bylines in exported seed

[MA2153]

What does this PR do?

emdash export-seed exported settings, collections, taxonomies, menus, widget areas, and content — but never bylines. The seed format and the applySeed import side both fully support bylines (root SeedByline[] profiles and per-entry SeedBylineCredit[] credits), so an exported seed silently dropped every author credit and could never round-trip.

This adds:

• exportBylines() — emits one root profile per byline, deduped by translation_group (because SeedByline has no locale axis), and returns a group → seed-id map.
• Byline credits in exportContent() via a new getBylineCredits() helper. It reads _emdash_content_bylines directly — byline_id there already stores the translation group, so it maps straight to seed ids, stays locale-agnostic, and avoids the locale-sibling fan-out a hydrated read would cause.

Developed with TDD: failing tests first (profiles, ordered credits + roleLabel, empty-omission, and a full export → applySeed → verify round-trip), then the implementation. New tests 4/4 pass; the broader seed + CLI suites stay green (118/118).

Closes #

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 (the emdash core package typechecks clean)
• pnpm lint passes (changed files are lint-clean; the only repo-wide lint/typecheck failures are pre-existing and live in unrelated plugin/registry packages with unbuilt dist outputs)
• pnpm test passes (targeted: tests/unit/seed/* + tests/unit/cli/seed-commands.test.ts, 118/118)
• 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) — n/a, CLI-only change, no admin strings
• I have added a changeset (if this PR changes a published package) — emdash patch
• New features link to an approved Discussion — n/a, bug fix

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Claude Opus 4.8 (Claude Code)

Screenshots / test output

 Test Files  1 passed (1)
      Tests  4 passed (4)   tests/unit/seed/export-bylines.test.ts

 Test Files  7 passed (7)
      Tests  118 passed (118)   seed + CLI suites

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 66c87f6

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

This PR includes changesets to release 14 packages

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

Not sure what this means? Click here to learn what changesets are.

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

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commit: 66c87f6

[emdashbot]

This is a focused, well-scoped bug fix: emdash export-seed never exported byline profiles or per-entry credits, despite both the seed format and applySeed supporting them. The PR adds exportBylines() and getBylineCredits() to the exporter, wired before content export so the emitted root bylines[] can be referenced by each entry's bylines[] array.

Approach judgment: Correct and idiomatic. It mirrors the existing export patterns (taxonomy, menus, widget areas), uses the same cursor-pagination + locale-agnostic junction read the codebase already relies on, and keeps the deterministic seed-local id generation style (byline:${slug} with a group-based disambiguation fallback). The implementation is aware of the i18n model: SeedByline has no locale axis, so one profile is emitted per translation_group; the content credits read byline_id straight from _emdash_content_bylines (which stores the translation group, not a row id), avoiding locale-sibling fan-out.

What I checked:

• Diff against origin/main.
• Full changed files (export-seed.ts, export-bylines.test.ts, changeset).
• applySeed.ts round-trip logic for bylines and credits.
• BylineRepository to confirm _emdash_content_bylines.byline_id stores translation_group.
• validateSeed to confirm byline/bylines credit validation already existed.
• Existing tests that call exportSeed to ensure nothing is broken by the new output key.

Conclusion: No issues found. The implementation is clean, SQL is parameterized via Kysely, tests cover profiles, ordered credits with roleLabel, empty-omission, and a full export → applySeed → verify round-trip. The changeset is present and correctly describes a patch bump for emdash. LGTM.

[ascorbic]

Thanks!

[ascorbic]

@MA2153 there's a conflict. COuld you resolve it?

[MA2153]

@ascorbic Done! Thanks for the ping.