refactor: remove @supabase/server/wrappers module

[tomaspozo]

Summary

• Remove the @supabase/server/wrappers entry point and verifyWebhookSignature utility
• Webhook signature verification varies too much across providers (Stripe uses timestamps, GitHub uses different headers, etc.) to justify a generic helper — each case should use the provider's own SDK
• The module is currently unused and removing it now keeps the export surface clean for when we add more wrappers with a clearer scope later

Changes

• Delete src/wrappers/ (source, barrel export, tests)
• Remove ./wrappers from package.json exports and tsdown.config.ts entry
• Remove references from SKILL.md and docs/security.md

[Copilot]

Pull request overview

Removes the unused @supabase/server/wrappers public entry point (and its generic webhook signature helper) to keep the package’s export surface focused on core primitives and adapters.

Changes:

• Removed src/wrappers/ (implementation, barrel export, and tests).
• Dropped the ./wrappers export from package.json and removed the wrappers build entry from tsdown.config.ts.
• Updated docs (SKILL.md, docs/security.md) to remove references to the wrappers entry point and verifyWebhookSignature.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsdown.config.ts	Removes wrappers from the build entry list.
src/wrappers/webhook.ts	Deletes verifyWebhookSignature implementation.
src/wrappers/webhook.test.ts	Removes tests covering verifyWebhookSignature.
src/wrappers/index.ts	Removes the wrappers barrel export.
package.json	Removes ./wrappers from exports.
SKILL.md	Removes wrappers entry point and webhook example referencing it.
docs/security.md	Removes webhook signature verification section and references to wrappers implementation.

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