Ready to be public and open to contributors; CI on Linux and macOS with manifest validation

[parintorns]

What changes

Prepares the repository to be made public and open to contributors. No change to the plugin's behaviour: scripts/mailbox.py changes only in prose (a docstring and the text it gives the session, where the name is now written "Animus").

• File format in this repository. docs/agent-mailbox.md describes the mailbox format the plugin shares with Animus: the mailbox, the pointer, sending, the message format, and what Animus does with a message. The README, the skill and the script point to it.
• README for people who already run Animus: what the plugin does, install and a check, use, what it writes and reads (~/.agent-mailbox pointers, the mailbox in the plugin's data folder, the first line of the last reply read from the transcript), uninstall, development, contributing and license.
• LICENSE (MIT) and SECURITY.md (private reporting; what the plugin touches, with prompt injection through an inbox message in scope).
• Contributors: CONTRIBUTING.md, CODE_OF_CONDUCT.md (Contributor Covenant 2.1), .github/CODEOWNERS, issue templates (bug, feature; blank issues off; security goes to private advisories) and a pull request template.
• Naming: "Animus" in all prose; identifiers keep lowercase (animus-mailbox, ANIMUS_AGENTS_DIR, from: animus).
• CI: the unit tests run on ubuntu-latest and macos-latest (the plugin runs on the Mac and walks the process tree with ps). A new validate job installs Claude Code and runs claude plugin validate --strict on the marketplace, plugin.json and skills. marketplace.json gains the description the strict check asks for.

The required status checks on main move from test to test (ubuntu-latest), test (macos-latest) and validate.

Checks

• python3 -m unittest discover -s tests: 18 OK locally (macOS).
• claude plugin validate --strict on ., .claude-plugin/plugin.json and skills: passed locally.

🤖 Generated with Claude Code

[endgame-code-triage]

Reviewed at 8da182ce. I read the full files: all 18 changed files (both old and new versions for modified files), plus hooks/hooks.json.

I traced the code paths in scripts/mailbox.py — all changes are capitalization of "animus" → "Animus" in string constants and user-facing strings, with identifiers kept lowercase per the stated convention. I verified the naming consistency repo-wide via grep. I confirmed the marketplace.json description field has no code consumers beyond the validation tool. I checked that the test string changes in test_mailbox.py align with the startswith("<task-notification" guard in mailbox.py (it doesn't inspect tag content).

Confidence: 90/100 because every change is documentation, community files, CI configuration, or branding capitalization with no behavioral or correctness impact.

There are no review comments to provide on this diff.