chore: declare agent-plugins.org 1.0.0 manifest in root plugin.json

[shashikanth171]

Summary

• Upgrades the root plugin.json from a bare Claude-style stub to a valid Agent Plugins 1.0.0 manifest (``, version, description, author, license, keywords).
• No other changes needed: skills/ already holds all six skills in the portable Agent Skills layout, so compatible clients discover them as-is.

Notes

• Metadata mirrors package.json (v4.9.0, MIT, same author/homepage).
• Zero runtime effect today — no client ships an Agent Plugins loader yet. This is free optionality for when they do; worst case it's one file to delete.
• Verified with a self-check that validates the manifest fields and discovers all six skills (ponytail, ponytail-audit, ponytail-debt, ponytail-gain, ponytail-help, ponytail-review) with matching frontmatter.

[shashikanth171]

Update: Agent Plugins adoption (as of Aug 22, 2026)

This manifest is no longer speculative — the spec shipped 1.0.0 on Aug 6, 2026 (Vercel, with Amazon, Anysphere/Cursor, GitHub, Microsoft, OpenAI on the TSC) and real clients load it today.

Compatible clients (agent-plugins.org/compatible-clients):

Client	Notes
OpenAI Codex / ChatGPT	v0.146.0 added manifests + workspace publishing; v0.147.0 portable install + catalog search
Cursor	launch partner
VS Code	launch partner
GitHub Copilot	launch partner
Kiro	launch partner
Google Agents CLI + Data Agent Kit	Google joined TSC Aug 7; more products planned

What this means for this PR: all six skills/* are already Agent Skills-format, so the above clients can discover them from this repo's root plugin.json today.

What still doesn't travel (v1 scope = skills + MCP only): ponytail's always-on ruleset injection via hooks and the /ponytail slash commands stay client-specific — so the existing per-agent adapters (.opencode/, .claude-plugin/, rules copies) remain necessary for full behavior. Notably Anthropic is absent: Claude Code keeps its own plugin format, and opencode isn't on the list either — both still install via their native mechanisms.