[codex] Reframe Ghost fingerprint capture

[nahiyankhan]

🤖 Opened by my AI agent.

Summary

• Reframe the public Ghost workflow around agent-led Fingerprint Capture instead of “scan” as the branded workflow.
• Rename the skill recipe surface so capture is the end-to-end fingerprint workflow and the old proposal-capture flow becomes propose.
• Preserve and document scan evidence readiness states so agents know when a bundle is product-observed, component-demo, substrate-only, or unobservable.

Validation

• pnpm exec vitest run packages/ghost/test/cli.test.ts packages/ghost/test/scan-status.test.ts
• pnpm check
• pnpm test
• Pre-push hook also ran pnpm build, pnpm check, and pnpm test.