Pricing model & rate card

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Problem: No published pricing exists for customers to evaluate before signing up.

Area: Product decision

Proposal: Set an actual rate card informed by #4781's economics spec and #4790's pricing mechanism, and publish it alongside #4806's documentation.

Deliverables:

• A published rate card.

Acceptance criteria:

• A prospective customer can determine what a given idea/loop will cost before submitting it.

Boundaries:

• Blocked on gittensor rental economics spec #4781 and Stake/payment → compute-time pricing #4790. This is a business decision, not an engineering one — treat it as requiring explicit sign-off before publishing.

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Part of #4778.

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JSO-3476