feat(webhooks): add replay-webhook-event tool

[gabrielmfern]

Adds a tool for the new webhook event replay endpoint.

Tool	Endpoint
replay-webhook-event	POST /webhooks/{webhook_id}/events/{event_id}/replay

The same tool lands in the remote server in the monorepo, with the same name, schema, and output text — another agent is opening that PR in parallel, so both servers stay in sync.

Blocked on the resend-node 6.26.0 npm publish

This bumps resend to 6.26.0 for webhooks.events.replay(), added in resend/resend-node#1087 (merged upstream, not yet published to npm). pnpm install --frozen-lockfile will fail on this PR as committed until that version reaches the registry: resend/resend-node#1087.

Verified locally instead by building against that branch: pnpm add resend@file:<local resend-node checkout> (dist built there, package.json at 6.26.0), then ran tests/build/lint against the real package. Before committing, package.json and pnpm-lock.yaml were restored to a plain 6.26.0 semver pin (no file: reference) so the diff reads like a normal version bump — its resend@6.26.0 lockfile entry carries the old 6.25.0 integrity hash as a placeholder and needs pnpm install to regenerate it for real once the package is published.

Notes

• Mirrors get-webhook-event's shape: same two params (webhookId, eventId), same error format.
• Unlike the read-only event tools from feat(webhooks): add event inspection tools #221, this is a write action, so it carries no annotations object — same convention as create-webhook/update-webhook/remove-webhook.
• The description calls out that a manual replay does not schedule further automatic retries, so the model doesn't imply otherwise.
• Also bumps the package version to 2.19.0, matching how feat(webhooks): add event inspection tools #221 bumped both resend and the package version in the same PR when it needed a fresh SDK method.

Checks

• pnpm test: 20 files, 224 passed (run against the local resend-node build described above).
• pnpm build: clean (run against the local build).
• pnpm lint: clean — same 3 pre-existing biome warnings in cli/resolve.ts and transports/http.ts as feat(webhooks): add event inspection tools #221, unrelated to this change.
• node ./scripts/check-dependency-versions.ts: passes against the final committed package.json.
• pnpm install --frozen-lockfile against the final committed lockfile: fails with a 404 fetching resend@6.26.0 from the registry, as expected — this is the blocker above, not a lockfile bug.
• No live API calls (replay is a write endpoint and there is no key configured).

Spec PR: resend/resend-openapi#112
Public API PR: resend/resend-monorepo#9535
SDK method: resend/resend-node#1087

Part of DEV-2005.

Linear: https://linear.app/resend/issue/DEV-2018