Add AGENT.md, Code of Conduct, and minor community files - #14

Summary

Repo-tuning follow-up from a community-files audit. MIT LICENSE is unchanged. No product code refactors.

Verified gaps (before)

• No root AGENT.md / AGENTS.md
• No CODE_OF_CONDUCT.md

Changes

Other gaps considered (left as-is)

• Dependabot (.github/dependabot.yml) — already configured for github-actions and uv.
• CI coverage — workflow already runs uv run coverage run -m pytest and uv run coverage report (respects fail_under = 85 in pyproject.toml).
• Pinned actions — actions/checkout@v7, astral-sh/setup-uv@v7, aquasecurity/[email protected] are current; no bump in this PR.

Local verification

Environment: uv sync --group dev --locked (Python 3.11.18).

Commands run (same intent as CI):

export ANSIBLE_CONFIG=ansible/ansible.cfg ANSIBLE_HOME=.ansible ANSIBLE_LOCAL_TEMP=.ansible/tmp
uv run ruff check .
uv run coverage run -m pytest
uv run coverage report
uv run ansible-playbook --syntax-check -i ansible/inventories/example/hosts.ini ansible/playbooks/ping.yml
uv run ansible-playbook --syntax-check -i ansible/inventories/example/hosts.ini ansible/playbooks/collect.yml
uv run ansible-lint ansible/playbooks ansible/roles
shellcheck -x scripts/*.sh

Results

• Ruff: all checks passed
• Pytest: 51 passed
• Coverage: TOTAL 90% (above 85% fail_under)
• Ansible syntax-check: OK (ping.yml, collect.yml)
• ansible-lint: 0 failures (production profile)
• shellcheck: exit 0