Marketplace polish and Claude Code / Gemini CLI install support (0.1.9)

[jklappstein]

Summary

Two commits on this branch:

1. Cursor Marketplace polish — clearer listing description and keywords, expanded README (what's included, auth, examples, pricing, security, support), general-purpose hydracept-image skill wording, CHANGELOG notes. Cursor stdio MCP in mcp.json unchanged (python -m hydracept mcp serve).

2. Multi-client install (0.1.9) — .claude-plugin/ (hosted MCP at https://api.hydracept.com/mcp, API key via ${user_config.api_key}), root gemini-extension.json, README sections for Claude Code, Claude Desktop, Google Antigravity, and Gemini CLI, and GitHub Actions manifest validation.

Validation

Run locally (Node 22+):

npm i -g @anthropic-ai/claude-code @google/gemini-cli

Full validation output (CI-equivalent)

=== JSON parse ===
OK .cursor-plugin/plugin.json
OK .cursor-plugin/marketplace.json
OK .claude-plugin/plugin.json
OK .claude-plugin/marketplace.json
OK gemini-extension.json
OK mcp.json
=== claude plugin validate --strict . ===
Validating marketplace manifest: /workspace/.claude-plugin/marketplace.json

✔ Validation passed
=== claude plugin validate --strict .claude-plugin/plugin.json ===
Validating plugin manifest: /workspace/.claude-plugin/plugin.json

✔ Validation passed
=== gemini extensions validate . ===
Extension . has been successfully validated.
=== claude plugin marketplace add ./ ===
Adding marketplace…✔ Marketplace 'hydracept' already on disk — declared in user settings
=== claude plugin install hydracept@hydracept ===
Installing plugin "hydracept@hydracept"...✔ Plugin "hydracept@hydracept" is already installed (scope: user)
=== claude plugin details hydracept ===
Hydracept (hydracept) 0.1.9
  Description: Image, audio, video, 3D, and text generation for coding agents through one remote MCP server (https://api.hydracept.com/mcp).
  Source: hydracept@hydracept

Component inventory
  Skills (7)  hydracept, hydracept-doctor, hydracept-image, hydracept-init, hydracept-setup, hydracept-sheet, hydracept-smoke
  Agents (0)
  Hooks (0)
  MCP servers (1)  hydracept  (tool schemas resolved at runtime; not counted)
  LSP servers (0)

Notes

• No root plugin.json for Antigravity; README documents ~/.gemini/config/mcp_config.json / .agents/mcp_config.json with serverUrl.
• MCP endpoint is always https://api.hydracept.com/mcp (not https://hydracept.com/mcp).