docs(agents): add a GEMINI.md pointer to the maintained instructions

[hyperpolymath]

Adds a GEMINI.md pointer file to this repository.

Why. An estate-wide census found a large asymmetry in agent-instruction
files: CLAUDE.md was present almost everywhere, GEMINI.md in a handful of
repositories. Any coding agent that looks for GEMINI.md and does not find one
proceeds with no repository-specific instructions at all.

This file is a pointer, not a second copy of the instructions. Duplicating
guidance across per-agent files guarantees the copies drift. The pointer
redirects to whichever file this repository actually maintains — AGENTS.md
where one exists, otherwise CLAUDE.md — and says to retarget it at
AGENTS.md when one lands.

How this commit was built. The change was made with git plumbing against
origin/<default branch>, not by staging a working tree. The branch contains
exactly one commit adding exactly one file, and carries none of the unrelated
local state present in this checkout. A per-repository assertion required
git diff --name-only <base> <commit> to equal the expected path set exactly,
or the branch was never created.

This PR is opened as a draft on purpose. It is part of a bulk campaign and
is not requesting a merge. Review and merge at your discretion.

🤖 Generated with Claude Code

https://claude.ai/code/session_011eQ7hibx92N7fBDtwgReWk

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: a8195518-6e1f-425f-b165-04d517509c6c

📥 Commits

Reviewing files that changed from the base of the PR and between fe6cc19 and dc4e062.

📒 Files selected for processing (1)

• GEMINI.md

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

📜 Recent review details

⏰ Context from checks skipped due to timeout. (14)

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🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: CR
Repo: hyperpolymath/aggregate-library

Timestamp: 2026-09-08T23:48:13.206Z
Learning: Do not duplicate rules here.

🔇 Additional comments (1)

GEMINI.md (1)

1-8: LGTM!

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Added guidance for automated coding tools, directing them to the project’s current contribution instructions.
  • Clarified which tool-specific content should be disregarded.
  • Documented the transition path for updating these references when a dedicated agents guidance file becomes available.

Walkthrough

Adds GEMINI.md with instructions for agents to use CLAUDE.md, skip Claude Code-specific tooling guidance, and update the pointer when AGENTS.md exists.

Changes

Agent instruction pointer

Layer / File(s)	Summary
Instruction pointer GEMINI.md	Adds instructions for agents to read CLAUDE.md, skip Claude Code-specific tooling content, and retarget the pointer to AGENTS.md when that file exists.

Priority: ⬇️ Low

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

Merge Risk: ⚪ Minimal · up to dc4e0

GEMINI.md directs Gemini-family agents to the existing repository guidance without duplicating rules. No current merge-readiness risk remains.

Suggested reviewers: metadatastician

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a GEMINI.md pointer to the maintained agent instructions.
Description check	✅ Passed	The description explains the GEMINI.md pointer, its purpose, its retargeting behaviour, and the scope of the change. It is directly related to the changeset.

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_{A rabbit reads the guide,
GEMINI points the way,
Claude’s notes stay beside,
Until AGENTS joins the day,
Clear paths help burrows play.}

_{Comment @coderabbitai help to get the list of available commands.}