fix(runtime): forward concurrent initial deliveries

[iroiro147]

Summary

• forward a duplicate initial delivery to the session that already owns the requested continuation token when workflow start races with an existing hook owner
• keep unrelated hook conflicts on the original error path by requiring an exact token match before forwarding
• reuse the runtime run-handle creation path for both newly started and forwarded-to-owner sessions
• add a patch changeset

Refs #624.

Tests

• pnpm --filter eve run build:compiled
• pnpm --filter eve exec vitest run --config vitest.unit.config.ts src/execution/workflow-runtime.test.ts src/channel/send.test.ts
• pnpm --filter eve run typecheck
• pnpm exec oxfmt --check packages/eve/src/execution/workflow-runtime.ts packages/eve/src/execution/workflow-runtime.test.ts .changeset/strong-deliveries-queue.md
• pnpm exec oxlint --deny-warnings packages/eve/src/execution/workflow-runtime.ts packages/eve/src/execution/workflow-runtime.test.ts
• pnpm guard:invariants
• git diff --cached --check
• pnpm changeset status --since origin/main
• pnpm --filter eve exec vitest run --config vitest.unit.config.ts src/execution/workflow-entry.test.ts src/execution/session-delivery-hook.test.ts src/execution/turn-control-receiver.test.ts src/execution/turn-workflow.test.ts

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