DOC-2045: Add missing limits to Serverless usage limits

[micheleRP]

Description

Add Producer IDs, Schema Registry (max schemas, max subjects, rate limit), Connect pipelines, MCP servers, and AI agents limits to the Serverless cluster type page.

Resolves https://redpandadata.atlassian.net/browse/DOC-2045
Review deadline:

Page previews

Serverless usage limits

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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📝 Walkthrough

Walkthrough

This pull request updates the Serverless documentation page by expanding the usage limits section. It adds new limits for Producer IDs (250), Schema Registry (with max schemas, subjects, and rate limits), Connect pipelines (10), MCP servers (10), and AI agents (10). Additionally, a formatting inconsistency on the Connections limit entry is corrected.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

Possibly related PRs

• DOC-1724 fix typo #429 — Modifies the Serverless documentation's Redpanda Connect section, removing beta wording while this PR adds Connect pipelines usage limits.
• DOC-1350 Document feature Serverless on GCP #432 — Restructures Serverless usage limits content into a table format, providing context for the new limit entries added in this PR.
• DOC-1351 Serverless connection limit #340 — Edits the Connections entry in Serverless usage limits, directly overlapping with the formatting correction made in this PR.

Suggested reviewers

• Feediver1
• nicolaferraro
• towfiqa

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding missing usage limits to the Serverless cluster type documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description follows the required template with all essential sections completed: description, page previews, and checks marked appropriately.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch DOC-2045-Add-missing-limits-to-Serverless-Limits-page

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@modules/get-started/pages/cluster-types/serverless.adoc`:
- Line 33: The page currently contradicts itself by listing "Connect pipelines"
as allowed for Serverless while elsewhere stating "Kafka Connect" is
unsupported; update the Serverless doc to resolve this by either (a) editing the
unsupported-features section to explicitly allow "Connect pipelines" or (b)
clarifying terminology—make a clear distinction between "Connect pipelines"
(supported) and "Kafka Connect" (unsupported) wherever both terms appear
(notably the line that says "Kafka Connect" is unsupported and the bullet that
lists "Connect pipelines"); ensure the wording consistently states which feature
is supported and, if both coexist, add a short parenthetical definition so
readers know they are different.

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ℹ️ Review info

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📥 Commits

Reviewing files that changed from the base of the PR and between bc03873 and f41b8fa.

📒 Files selected for processing (1)

• modules/get-started/pages/cluster-types/serverless.adoc

[towfiqa]

Looks awesome!

[Feediver1]

lgtm