docs: update compensation amounts to what was in the council contract

[Kelketek]

Description

This pull request updates the compensation amounts to what ended up in the Tari Council agreement actually signed by members.

Motivation and Context

Tari Labs feels the increased amount is important to improve incentives and increase the sense of investment in the project for council members.

The contract provided to Tari Council members, and signed by them, contains the amount specified. This now makes this change publicly viewable and subject to comment and review by the community so adjustments can be made as needed.

[gemini-code-assist]

Code Review

This pull request updates the Tari Community Charter to increase the council members' monthly stipend to 400,000 XTM and the USD-equivalent reference cap to $8,000, while removing the explicit reference rate. The reviewer pointed out that removing the reference rate introduces ambiguity regarding how the USD cap is calculated and suggested specifying a new reference rate of $0.02 per XTM to maintain clarity.

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[gemini-code-assist]

The removal of the forward-looking reference rate (previously $0.04 per XTM) leaves the $8,000 USD-equivalent reference cap without a defined baseline or pricing source in the charter. Without a specified reference rate or a defined pricing mechanism, the cap is ambiguous and difficult to enforce. To maintain clarity and transparency for the community, consider specifying a new reference rate (such as $0.02 per XTM to align 400,000 XTM with the $8,000 cap) or explicitly stating that the reference rate is determined according to the Council's published calculation method.

Suggested change

Council members shall receive a monthly stipend of 400,000 XTM for their service, subject to a USD-equivalent reference cap of $8,000 per month. The Council shall publish the calculation method used to determine the stipend and shall review it no less than quarterly. Any increase to the stipend, or change to the calculation method, shall require the charter amendment process and community ratification.

Council members shall receive a monthly stipend of 400,000 XTM for their service, subject to a USD-equivalent reference cap of $8,000 per month calculated at a forward-looking reference rate of $0.02 per XTM. The Council shall publish the calculation method used to determine the stipend and shall review it no less than quarterly. Any increase to the stipend, or change to the calculation method, shall require the charter amendment process and community ratification.

[Kelketek]

Noting that this was removed since it wasn't in the eventually signed agreement. Here's what the agreement I was given and signed said, for context:

You will receive a monthly stipend of​​400,000 XTM​​for each full month of service. The monthly​ stipend is capped at US$8,000. If 400,000 XTM exceeds that value, the Foundation will reduce​ the number of XTM delivered so the value does not exceed the cap. Unless otherwise approved​ under the Charter, valuation will be based on a consistently applied 30-day volume-weighted​ average price using CoinGecko, CoinMarketCap, or another comparable pricing source​ selected by the Foundation in good faith. Payments are generally made monthly in arrears.​

[Kelketek]

Thinking that the way to resolve this framing discrepancy will need to come out of some better understanding of the legal apparatus used for organizing the council (the foundation has a legal entity) and potentially a revised agreement that defers to this charter rather than inlining it, if that's legally feasible.