feat(*): remove keyless bootstrap from astro, nuxt, react-router, and tanstack-react-start

[djgould]

Description

Part 4 of the keyless→CLI stack (#9491 → #9493 → #9487 → #9488), stacked on #9493. Applies the same pattern to the remaining keyless consumers — @clerk/astro, @clerk/nuxt, @clerk/react-router, @clerk/tanstack-react-start:

• With missing keys, each SDK now fails with CLI-pointing guidance instead of provisioning a keyless application: astro/nuxt surface the parsePublishableKey fatal error from feat(shared): point missing and invalid key errors at the Clerk CLI #9491, and react-router/tanstack surface their existing secret-key errors, now extended with the npx clerk@latest init guidance. No new per-SDK error constants; the now-unused canUseKeyless feature-flag modules are deleted.
• Removes each SDK's keyless/ service, claim-prompt plumbing (__internal_keyless_* props), and cookie/state sync. The astro/nuxt keyless blocks previously swallowed all errors in a bare catch {}; the new throws sit outside them.
• react-router/tanstack loadOptions secret-key checks are now unconditional (previously skipped under canUseKeyless).
• The tanstack keyless integration test was a verbatim react-router copy running in the react-router lane; it now uses the tanstack preset and @tanstack-react-start tag.

@clerk/shared/keyless and the backend accountless API are intentionally untouched — older published SDK versions resolve ^-ranged @clerk/shared and still call them. They are deprecated in the follow-up PR and removed in the next major.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other: experiment / RFC

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Aug 18, 2026 8:43pm
swingset	Ready	Preview	Aug 18, 2026 8:43pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 9bb477c

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

This PR includes changesets to release 4 packages

Name	Type
@clerk/astro	Minor
@clerk/nuxt	Minor
@clerk/react-router	Minor
@clerk/tanstack-react-start	Minor

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commit: d7e46e6