Slim down CHARTER.md / GOVERNANCE.md after charter moves to central repo

[PederHP]

Background

The FSIG charter is being moved to the central modelcontextprotocol repo in the current official template format (docs/community/interest-groups/financial-services.mdx). The new template intentionally omits governance boilerplate (decision-making, meeting rules, antitrust, maintainer ladder) because those now live centrally in Working and Interest Groups.

Once that upstream charter is merged and live, our repo-local CHARTER.md and GOVERNANCE.md will duplicate content that is now canonical elsewhere.

Task

After the upstream charter PR merges:

• Slim CHARTER.md down to a short pointer to the canonical charter, keeping only FSIG-specific content not covered centrally (e.g. the extensions → SEP promotion strategy, meeting/agenda doc links).
• Slim GOVERNANCE.md similarly — defer governance rules to the central docs, keep only the current members table and anything FSIG-specific.
• Update README.md links to point at the canonical charter.
• Reconcile any wording the upstream review changed (e.g. Facilitator vs. Maintainer role naming, scope edits).

Why after merge, not before

• Keeps the repo docs authoritative for members until the upstream charter is actually live.
• Upstream review may tweak wording/role names/scope; slimming to the final merged version avoids a second pass.

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This issue was drafted by Claude (Claude Code) on behalf of @PederHP.