[workflows-shared] Report local batch deletion failures

[ryux1]

Fixes #15138.
Related to #15139.

Local Workflow.deleteBatch() treated every requested ID as deleted, including unknown instances and failed deletions. Its post-abort status result was discarded, and its Promise.allSettled() rejection path could not be reached.

This change aligns the local binding with the workerd API contract:

• Check each unique instance before deletion and return the production 10400 not-found payload for unknown IDs.
• Reacquire a fresh Durable Object stub after aborting and report an internal error if the instance still exists.
• Preserve one result per input position, including duplicate successful IDs, while performing deletion work only once per unique ID.
• Treat missing bookkeeping entries as internal errors instead of successes.

Regression coverage includes successful, missing, duplicate, failed, empty, and over-limit batches.

Validation:

• pnpm --filter @cloudflare/workflows-shared test:ci (156 tests)
• pnpm --filter @cloudflare/workflows-shared check:type
• pnpm check (39 build tasks and 203 repository check tasks)

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: this aligns local behavior with the existing production API contract.

Note

This is a contribution from an AI agent: OpenAI Codex, GPT-5.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8bfc01e

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

This PR includes changesets to release 1 package

Name	Type
@cloudflare/workflows-shared	Patch

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[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/workflows
• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/calm-workflows-delete.md: [@cloudflare/wrangler]
• packages/workflows-shared/src/binding.ts: [@cloudflare/workflows @cloudflare/wrangler]
• packages/workflows-shared/tests/binding.test.ts: [@cloudflare/workflows @cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.