Add agent-signage to Git Workflow plugins

[roli-lpci]

Summary

Adds agent-signage to the Git Workflow category.

The entry describes the Claude Code PreToolUse hook factually: it reports measured Git
checkout, symlink, conflict, worktree, binary, and generated-file state before file actions.
No security-enforcement claim is added.

Verification

• Current release: agent-signage 0.2.1 on PyPI.
• Current source: hermes-labs-ai/agent-signage main, commit ed3f6db (2026-09-19).
• Plugin and publication tests passed.
• The plugin manifest is valid JSON and declares Apache-2.0.

Maintainer disclosure

agent-signage is maintained by Hermes Labs; this is a self-submitted entry by its maintainer.

Rolando Bosch is the responsible human contributor. This contribution was selected through Hermes Labs’ autonomous triage and executed through its engineering infrastructure.