feat: publish Tower as an installable Claude Code plugin

[socksy]

The repo already had a Claude Code plugin (plugin.json + skills/tower/SKILL.md + .mcp.json) but no way for anyone to install it. A plugin only becomes installable once a marketplace catalog lists it, so this adds one.

Changes

• Add .claude-plugin/marketplace.json at the repo root, cataloguing the tower plugin with source: "./plugin"
• Move the plugin (plugin.json, skills/, .mcp.json) into a plugin/ subdirectory so installing it caches only the plugin, not the entire tower-cli repo
• Point the regenerate-skill workflow at the new plugin/skills/tower/SKILL.md path

plugin.json is unchanged: it relies on the default discovery of skills/ and .mcp.json relative to the plugin root, which still resolve after the move.

Install flow (once merged to the default branch)

/plugin marketplace add tower/tower-cli
/plugin install tower@tower-cli

Note

The root .mcp.json moved into plugin/. It was not gitignored, so it also auto-loaded the tower MCP server for anyone doing dev work in tower-cli itself. If that project-scoped behaviour is wanted, we can restore a copy at the root in a follow-up.

[coderabbitai]

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