feat(__future__): Experimental update-flag

[emyller]

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Contributes to #7642

Stabilises experimental update-flag endpoints to one option, still experimental.

• Avoids touching Options A + B — cleanup + interface migration PR will follow.
• Foundation of the code is in an experimental namespace.
• Includes key-based multivariate flag support.
• Improves API design.

How did you test this code?

Integration tests included.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Jul 25, 2026 1:10am
flagsmith-frontend-preview	Ignored		Jul 25, 2026 1:10am
flagsmith-frontend-staging	Ignored		Jul 25, 2026 1:10am

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