docs: add maintainers section to README

[helizaga]

Adds a Maintainers section to the README, between Contributing and License.

Why

The repository has a CODEOWNERS entry, but nothing in the README or CONTRIBUTING.md says who maintains the project. Anyone landing on the repo has to open the contributors graph to find out — which is a strange gap for a project with 1.7k stars and 30+ outside contributors.

The section also links the contributor list. Most of what gtr supports today came from outside contributions — editor and AI tool adapters, platform fixes, shell integrations, docs — and that is worth pointing at from the README rather than leaving it to the graph.

Changes

Docs only. No code, no behavior change, 9 lines added to README.md.

Testing

• Markdown renders correctly in the GitHub preview.
• Both links verified to return 200: the maintainer profile and the contributors graph.
• No shell files touched, so the ShellCheck lint job is unaffected.

Summary by CodeRabbit

• Documentation
  • Added a Maintainers section to the README.
  • Included credits for project creators, maintainers, and external contributors.
  • Added a link to the full contributor list.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 48fcd9a5-da93-43d3-b074-52003dc712e1

📥 Commits

Reviewing files that changed from the base of the PR and between c319233 and b0ac363.

📒 Files selected for processing (1)

• README.md

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Walkthrough

README.md now includes a Maintainers section. The section credits the project creator, maintainers, and external contributors. It also links to the repository contributor list.

Changes

Maintainers Documentation

Layer / File(s)	Summary
Add Maintainers section README.md	The README identifies the project creator and acknowledges external contributors. It links to the repository contributor list.

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

Merge Risk: ⚪ Minimal · up to b0ac3

This documentation-only change adds maintainer and contributor links without affecting product behavior or production operation; no actionable merge-blocking risk remains.

Suggested reviewers: averyjennings, natoboram, scarf005

Poem

A rabbit checks the README with care
New maintainer credits bloom there
Contributors hop into view
A link points to the list anew
The burrow applauds the update flair

🚥 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 and concisely describes the documentation change: adding a Maintainers section to the README.
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.

Full details: Docstring Coverage

Explanation

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 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tommy/docs-readme-maintainers

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