Improve llms relation loading

[ErisDS]

Summary

• Makes a short-term relation-loading change for /llms.txt and /llms-full.txt so we can verify whether it improves llms latency in the wild.
• Removes tags/authors relation loading from the llms entry fetches.
• Leaves the generated output unchanged.

Follow-up

• If this proves to improve latency in the wild, we can follow up with broader refactors to consolidate the llms entry-fetching path.

Testing

• pnpm install --frozen-lockfile
• pnpm test:single test/unit/frontend/services/llms/service.test.js — 12 passing
• pnpm test:single test/unit/server/services/url/lazy-url-service.test.js
• pnpm test:single test/unit/server/services/url/lazy-find-resource.test.js
• pnpm lint — completed with 2 existing warnings and no errors
• git diff --check

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 9de02b7 and fe50b60.

📒 Files selected for processing (2)

• ghost/core/core/frontend/services/llms/service.js
• ghost/core/test/unit/frontend/services/llms/service.test.js

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Walkthrough

Removed explicit withRelated: ['tags', 'authors'] from models.Post.findPage calls in fetchIndexEntries and fetchFullEntries of the LLM frontend service while keeping the same columns selection. Added unit tests that call getLlmsTxt() and getLlmsFullTxt() and assert Post.findPage is invoked twice per function with withRelated left undefined.

Possibly related PRs

• TryGhost/Ghost#27938: Related work around when tags/authors are loaded for Post queries used in URL generation.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Improve llms relation loading' directly summarizes the main change—removing tags and authors relation loading from LLMS entry fetches to improve latency.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the purpose (verify latency improvements), the specific changes (removing tags/authors relation loading), and testing performed.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch optimize-llms-index-related-loading

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