fix(core): persist taxonomies field on content_create/content_update MCP tools

[marcusbellamyshaw-cell]

What does this PR do?

Both MCP tools accepted a taxonomies field without error but never persisted it — the input schemas didn't declare it and nothing in the handler chain forwarded it to the taxonomy junction table. #621 added SEO and byline support the same way; taxonomies was the one field left out.

Adds TaxonomyRepository.setTaxonomiesForEntry(), keyed by taxonomy name with each value a list of term refs. Refs may be a term id or a slug (resolveTermRef falls back to a slug lookup scoped to the taxonomy name, since resolveTranslationGroup only matches id/group). Threaded through handleContentCreate/handleContentUpdate in the same transaction as the content write, mirroring the existing bylines wiring. On create, explicit taxonomies win over whatever copyEntryTerms inherited from a translationOf source.

Closes #953

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 (n/a — MCP tool, no admin UI strings)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion (n/a — bug fix)

AI-generated code disclosure

• This PR includes AI-generated code — model/tool: Claude Sonnet 5

Screenshots / test output

packages/core/tests/integration/mcp/content-taxonomies.test.ts — 3/3 pass; pnpm lint:quick clean; pnpm typecheck clean.

Opened as draft: fork already has several open PRs against this repo (non-collaborator open-PR limit).

[changeset-bot]

🦋 Changeset detected

Latest commit: c68b834

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

This PR includes changesets to release 16 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/do-demo-site	Patch
@emdash-cms/do-solo-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

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commit: c68b834

[github-actions]

Overlapping PRs

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

• feat(cron): add publish-due endpoint and rebuildHooks config #772 (3 shared files)
• feat(admin): add Taxonomy Types management page #213 (3 shared files)
• Harden plugin MCP tool registration #988 (3 shared files)

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

[ascorbic]

Thanks for the contribution. I'm going to close this as it is now redundant. I've merged #1874 which solved the same issue, but in a way that covered more of the edge cases.