fix(core/schema): persist titleField/dateField on PUT /schema/collections/{slug} (#2573)

[emdashbot]

What does this PR do?

Fixes the silent dropping of titleField and dateField on PUT /_emdash/api/schema/collections/{slug}.

• Adds both fields to updateCollectionBody as nullable slugs, so updates and clears reach the registry's existing persistence and validation logic.
• Adds both fields to collectionSchema, restoring the OpenAPI response contract.
• Exposes both fields through the schema_update_collection MCP tool.
• Adds regression coverage for preserving, clearing, validating, and returning the display fields.
• Includes a patch changeset for emdash.

Verification:

• The focused schema, registry, and OpenAPI tests pass (93 tests).
• pnpm --filter emdash typecheck passes.
• pnpm lint:quick passes and formatting was applied.
• The reporter confirmed the fix against an already-provisioned D1 database on EmDash 0.34.0, including persistence, invalid-field validation, and nullable clearing behavior.

Closes #2573.

A candidate change the reporter confirmed against their own site via the preview build:

npm i https://pkg.pr.new/emdash@bot/fix-2573

_{Opened automatically by emdashbot as a draft. A maintainer must review before merge.}

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 and reviewed the user-facing 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 — model/tool: emdashbot + Kimi K2.7 Code

Screenshots / test output

[changeset-bot]

🦋 Changeset detected

Latest commit: 8e253f9

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

This PR includes changesets to release 17 packages

Name	Type
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	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

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

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	emdash-demo-cache	8e253f9	Aug 20 2026, 09:45 AM

[cloudflare-workers-and-pages]

🚀 Deploying Preview to Cloudflare 🚀

Preview URL: https://bot-fix-2573.try.emdashcms.com, https://bot-fix-2573-emdash-playground.emdash-cms.workers.dev (commit 8e253f9)

This URL reflects your latest Preview deployment

Preview Deployments by commit

Status	Deployment URL	Commit	Updated (UTC)	See this deployment's details
Build: Success ✅ Deployment: Success ✅ View logs ↗	https://40de25f7.try.emdashcms.com, https://40de25f7-emdash-playground.emdash-cms.workers.dev	8e253f9	2026-08-20T09:45:59.003Z	Visit the dashboard ↗

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	emdash-demo-do	8e253f9	Aug 20 2026, 09:46 AM

[pkg-pr-new]

Open in StackBlitz

@emdash-cms/admin

npm i https://pkg.pr.new/@emdash-cms/admin@2581

@emdash-cms/auth

npm i https://pkg.pr.new/@emdash-cms/auth@2581

@emdash-cms/auth-atproto

npm i https://pkg.pr.new/@emdash-cms/auth-atproto@2581

@emdash-cms/blocks

npm i https://pkg.pr.new/@emdash-cms/blocks@2581

@emdash-cms/cloudflare

npm i https://pkg.pr.new/@emdash-cms/cloudflare@2581

@emdash-cms/contentful-to-portable-text

npm i https://pkg.pr.new/@emdash-cms/contentful-to-portable-text@2581

emdash

npm i https://pkg.pr.new/emdash@2581

create-emdash

npm i https://pkg.pr.new/create-emdash@2581

@emdash-cms/gutenberg-to-portable-text

npm i https://pkg.pr.new/@emdash-cms/gutenberg-to-portable-text@2581

@emdash-cms/plugin-cli

npm i https://pkg.pr.new/@emdash-cms/plugin-cli@2581

@emdash-cms/plugin-types

npm i https://pkg.pr.new/@emdash-cms/plugin-types@2581

@emdash-cms/registry-client

npm i https://pkg.pr.new/@emdash-cms/registry-client@2581

@emdash-cms/registry-lexicons

npm i https://pkg.pr.new/@emdash-cms/registry-lexicons@2581

@emdash-cms/registry-verification

npm i https://pkg.pr.new/@emdash-cms/registry-verification@2581

@emdash-cms/sandbox-workerd

npm i https://pkg.pr.new/@emdash-cms/sandbox-workerd@2581

@emdash-cms/x402

npm i https://pkg.pr.new/@emdash-cms/x402@2581

@emdash-cms/plugin-ai-moderation

npm i https://pkg.pr.new/@emdash-cms/plugin-ai-moderation@2581

@emdash-cms/plugin-atproto

npm i https://pkg.pr.new/@emdash-cms/plugin-atproto@2581

@emdash-cms/plugin-audit-log

npm i https://pkg.pr.new/@emdash-cms/plugin-audit-log@2581

@emdash-cms/plugin-color

npm i https://pkg.pr.new/@emdash-cms/plugin-color@2581

@emdash-cms/plugin-embeds

npm i https://pkg.pr.new/@emdash-cms/plugin-embeds@2581

@emdash-cms/plugin-field-kit

npm i https://pkg.pr.new/@emdash-cms/plugin-field-kit@2581

@emdash-cms/plugin-forms

npm i https://pkg.pr.new/@emdash-cms/plugin-forms@2581

@emdash-cms/plugin-webhook-notifier

npm i https://pkg.pr.new/@emdash-cms/plugin-webhook-notifier@2581

commit: 8e253f9