feat: generate downloadable service skill bundles

[rodaddy]

Goal

Add downloadable, service-specific skill/agent bundles for each configured MCP service entry.

Motivation

Agents should not have to poke around to discover commands, schemas, auth quirks, or safe usage patterns. A service entry should be able to publish a compact skill bundle that an agent downloads once, loads, and immediately knows how to call that service through mcp2cli.

Proposed shape

For each service in the registry, expose/export a bundle containing:

• service description and endpoint shape
• available tools and exact mcp2cli commands
• schemas summarized into agent-friendly examples
• auth/config requirements without secrets
• safe read/write boundaries
• common workflows
• known failure modes and error meanings
• freshness/version/hash metadata

Potential commands:

mcp2cli skills list
mcp2cli skills get open-brain --format hermes-skill > open-brain-mcp/SKILL.md
mcp2cli skills install open-brain --target ~/.hermes/skills/mcp/open-brain
mcp2cli skills diff open-brain

Acceptance criteria

• Skill output is deterministic and safe to commit/share when no secrets are present.
• Skill output includes exact runnable mcp2cli commands for each tool.
• Generated skills include schema/version/hash so agents can detect drift.
• Generated skills can be installed into Hermes skill directories or downloaded as an archive.
• Bundles can include service-specific examples like Open Brain session lanes, n8n workflow ops, Fleet Board task updates, etc.