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

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: ff073ddc-4b3a-405c-a756-a260d528be41

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Reviewing files that changed from the base of the PR and between aa65c2b and d56fa3b.

📒 Files selected for processing (1)

• GEMINI.md

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🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: CR
Repo: hyperpolymath/filesoup

Timestamp: 2026-09-08T23:50:41.757Z
Learning: Do not duplicate rules here.

🪛 GitHub Check: Hypatia

GEMINI.md

[warning] 1-1: Hypatia root_hygiene: stale
Stale AI session file -- delete

🔇 Additional comments (1)

GEMINI.md (1)

1-8: LGTM!

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Added a central guidance document for coding contributors.
  • Clarified where development instructions can be found and which tool-specific guidance should be omitted.
  • Included guidance for updating the reference when the project’s standard contributor instructions become available.

Walkthrough

Adds GEMINI.md as a pointer to the current coding-agent instructions in CLAUDE.md. It also specifies that the pointer must move to AGENTS.md when that file exists.

Changes

Agent instruction pointer

Layer / File(s)	Summary
Add agent instruction pointer GEMINI.md	Adds instructions to read CLAUDE.md, skip Claude Code-specific tooling, and retarget the pointer when AGENTS.md is added.

Priority: ⬇️ Low

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

Merge Risk: ⚪ Minimal · up to d56fa

This adds a documentation pointer for coding-agent guidance without changing runtime behavior or production data paths. The pointer targets the maintained instructions and is ready to merge.

🚥 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 addition of a GEMINI.md pointer to the repository instructions.
Description check	✅ Passed	The description directly explains the GEMINI.md pointer, its purpose, its target instructions, and the draft status.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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_{A rabbit finds the guide at dawn
GEMINI points the safe path on
CLAUDE lends the rules to read
AGENTS waits for future need
Clear signs help each hop proceed}

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