fix(docs): index the research document #17231 landed, unbreaking main

[mrveiss]

Thinking Path

main is red. test_every_research_document_is_reachable_from_its_index reports
present but unindexed: ['on-prem-private-ai-platform-stack'].

#17231 added docs/research/on-prem-private-ai-platform-stack.md and never added its row to
docs/research/_index.md. That is precisely the drift the test exists to catch — its own
docstring cites the index having drifted five documents — and I missed it when landing that PR.

This is base breakage: every open PR picks the red up on its next run, so it is deliberately
one line and separate from any other work, to merge ahead of the queue.

What Changed

One row appended to docs/research/_index.md, in the table's existing append order (the file is
chronological, not alphabetical — checked before inserting), describing the document and naming
its umbrella and child issues the way neighbouring rows do.

Verification

• grep confirms the slug is absent on origin/main and present once after the change.
• The row matches the | [[slug]] | description | shape of the surrounding entries, and sits
  before ## Related Sections like every other row.
• The document itself is unchanged.

Not verified locally: the test is not executed here — CI is the authority — but the assertion is
a set difference between files on disk and slugs in this index, and the missing slug is now
present.

Model Used

Claude Opus 5 (1M context)

Refs #17231

Summary by CodeRabbit

• Documentation
  • Added a research entry comparing on-premises private-AI platforms.
  • Documented gaps in the reachability of declared controls.
  • Linked the research to the relevant tracking issues.

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Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: mrveiss/AutoBot-AI/.coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: cf0f09bc-e4dc-493c-93ea-9852339ebb02

📥 Commits

Reviewing files that changed from the base of the PR and between 43d3762 and 04a5a3a.

📒 Files selected for processing (1)

• docs/research/_index.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The Documents index now includes the on-premises private-AI platform comparison. The entry records production reachability findings and links the related umbrella and child issues.

Changes

Research documentation

Layer / File(s)	Summary
Add research document entry docs/research/_index.md	The Documents index now lists on-prem-private-ai-platform-stack with its reachability findings and associated issues.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 04a5a

The documentation index change is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: it indexes the research document in the documentation index to restore the main branch.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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[mrveiss]

Folded into #17241 (fa38144388) rather than run as its own CI. A two-line docs fix does not justify a full suite, and queue depth was delaying the fix that matters. Content is identical.