feat(clerk-js): Backport exclusive-membership auto-activate for Core 2

[NicolasLopes7]

What

Backport of #8933 to the Core 2 (v5) line (release/core-2).

When the choose-organization session task fires for a member of an exclusive-membership organization, clerk-js now skips the org picker entirely: it shows the loading spinner and auto-calls setActive on that org (single-fire via useRef). On failure it surfaces the error and falls back to the normal choose/create flows. Non-exclusive members: zero change.

This brings the clerk-js half of exclusive-membership "after-auth" to customers still on the v5 / Core 2 line.

Changes

• Expose Organization.exclusiveMembership — parse the FAPI exclusive_membership field (@clerk/shared types + clerk-js Organization resource fromJSON / __internal_toSnapshot). undefined for non-adopting instances.
• TaskChooseOrganization — detect the membership whose organization.exclusiveMembership === true, render only the spinner and auto-setActive once, reusing the existing navigateOnSetActive / redirectUrlComplete wiring.

Core 2 adaptations (vs. the main/Core 3 original)

• The UI lives in clerk-js/src/ui on Core 2 (not the separate @clerk/ui package).
• SetActiveNavigate callback receives only { session } on Core 2 — decorateUrl was added in Core 3, so it's dropped from the navigate wiring.
• exclusiveMembership is anchored next to maxAllowedMemberships / adminDeleteEnabled since selfServeSSOEnabled does not exist on Core 2.

Notes

• Changeset bumps @clerk/clerk-js and @clerk/shared (minor). No @clerk/ui (Core 3 only).
• Base is release/core-2 — do not retarget to main.

[changeset-bot]

🦋 Changeset detected

Latest commit: d28e3a3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@clerk/clerk-js	Minor
@clerk/chrome-extension	Patch
@clerk/clerk-expo	Patch

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Project	Deployment	Actions	Updated (UTC)
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commit: d28e3a3