fix(core): include term description for flat taxonomies in getTaxonomyTerms()

[swissky]

What does this PR do?

getTaxonomyTerms() already fetches the data column (selectAll()), but the non-hierarchical branch dropped it when mapping rows to TaxonomyTerm — only hierarchical taxonomies (via buildTree) parsed description out of it. Descriptions set in the admin UI were silently undefined for flat taxonomies.

This adds the same one-line mapping the hierarchical path uses, plus a unit test covering both kinds of taxonomies (the flat case fails without the fix).

Context: we attach knowledge-graph links (e.g. wikidata:Q380274) to term descriptions and render them as sameAs in JSON-LD; flat taxonomies (tags, treatments) lost them.

Closes #1419

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 (packages/core; @emdash-cms/admin/marketplace builds fail on my machine on unrelated tooling, untouched by this PR)
• pnpm lint passes (lint:quick clean)
• pnpm test passes (targeted: packages/core/tests/unit/taxonomies/ — 4 files, 48 tests green; new test red without the fix)
• 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 — no UI strings)
• I have added a changeset (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: Cursor + Fable 5 (reviewed and verified by a human before submission)

Screenshots / test output

RUN  v4.1.5 packages/core
✓ tests/unit/taxonomies/get-taxonomy-terms.test.ts (2 tests) — with fix
✗ 1 failed (flat-taxonomy description) — without fix (TDD check)
Test Files  4 passed (4)   Tests  48 passed (48)   # full unit/taxonomies folder

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[changeset-bot]

🦋 Changeset detected

Latest commit: 5a4231a

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

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

[swissky]

I have read the CLA Document and I hereby sign the CLA

[emdashbot]

This is a clean, well-scoped bug fix. The approach is sound: getTaxonomyTerms() already fetched the data column, and the PR simply adds the same description extraction that the hierarchical branch (buildTree) and getTerm already used. The flat-taxonomy branch was the only place silently dropping it.

I checked:

• The one-line fix matches the existing pattern elsewhere in the module.
• The new unit test covers both flat and hierarchical taxonomies (the PR author verified the flat case fails without the fix).
• Locale filtering is unchanged and correct.
• A changeset is present and well-written.
• No SQL, auth, API route, or admin UI changes, so AGENTS.md conventions around those areas don't apply.

One suggestion: getEntryTerms in the same module also selects data via selectAll("taxonomies") but drops description when mapping rows. It's the exact same bug pattern, so it's worth a quick follow-up if entry-level term rendering also needs descriptions.