Add handoffs frontmatter to skill bundle recipes

[nahiyankhan]

Summary

• Each recipe (profile, review, verify, generate, compare, discover) now declares its common next actions as structured frontmatter — either another recipe via skill: or a CLI invocation via command:.
• Pattern borrowed from DirectedEdges/specs' agent handoff convention, adapted for Ghost's skill bundle model.
• Purely additive: the bundle loader copies files verbatim, so hosts that ignore unknown frontmatter keys see no change; hosts that read it can surface next-step actions inline.

Handoff graph

• profile → compare (benchmark) or ghost emit review-command (set up drift detection)
• review → verify (regenerate to match) or ghost ack / ghost diverge / ghost adopt (record stance)
• verify → generate (regenerate with feedback) or profile (capture a missing decision)
• generate → verify (confirm the output stays in bounds)
• compare → ghost ack / ghost adopt / ghost diverge
• discover → profile / compare

Notes

• schema.md left alone — it's a reference, not a recipe.
• No host harness currently parses the handoffs: key; it's documentation the host agent can read and act on. Wiring a parser would be a follow-up.

Test plan

• pnpm check passes (pre-push hook)
• pnpm build passes (pre-push hook)
• pnpm test passes — 159 tests (pre-push hook)
• Manually verify ghost emit skill <dir> copies the updated reference files with frontmatter intact

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