chore: relicense project under GPLv3

[grunch]

Relicenses this project from MIT to the GNU General Public License v3.0 (SPDX GPL-3.0-only), as part of an org-wide relicensing of every MostroP2P repository.

Changes

• LICENSE

• README.md

• LICENSE now holds the verbatim GPLv3 text from https://www.gnu.org/licenses/gpl-3.0.txt (674 lines).

• The README license section (and badge, where present) points at GPLv3. Where the README had no license section, one was added.

• Package metadata (Cargo.toml / package.json) declares GPL-3.0-only so the license is machine-readable; the field was added where it was previously absent.

Notes for reviewers

• Vendored third-party files keep their own licenses and were deliberately left untouched.
• MIT is GPLv3-compatible, so the previously MIT-licensed history can be redistributed under GPLv3. Merging this is a maintainer/copyright-holder decision, not a mechanical one — please confirm before merge.

🤖 Generated with Claude Code

https://claude.ai/code/session_01AeaT3mK6fazbUn9kcTrKxL

Summary by CodeRabbit

• Documentation
  • Added licensing information stating that the project is distributed under the GNU General Public License v3.0.
  • Included the complete license terms for reference.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-06T23:26:01.007821Z	8d4fbfb	PR opened

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 066d50b5-4daa-40fc-947d-e7a78bbb018c

📥 Commits

Reviewing files that changed from the base of the PR and between 893e008 and 8d4fbfb.

📒 Files selected for processing (2)

• LICENSE
• README.md

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

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Walkthrough

The project adds the complete GNU General Public License v3.0 text and documents the license in the README with a link to the new LICENSE file.

Changes

Project licensing

Layer / File(s)	Summary
License declaration and legal text LICENSE, README.md	Adds the complete GPLv3 license text and a README section that identifies the project license and links to LICENSE.

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

Merge Risk: ⚪ Minimal · up to 8d4fb

This change adds the GPLv3 license text and documents it in the README, with no product runtime behavior affected. No merge-blocking implementation risk remains.

Poem

A rabbit reads each line,
The patch grows clear beneath the moon,
Small changes hop in place,
Terms guard the garden path,
Reviews bloom before the dawn.

🚥 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 main change: relicensing the project under GPLv3. The LICENSE and README.md changes support this description.
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)

• Create PR with unit tests
• Commit unit tests in branch chore/relicense-gplv3

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