[Workflows] Implement Workflows instance methods

[pombosilva]

Fixes WOR-1182.

This PR implements the 4 missing Workflow instance lifecycle methods for local dev: pause(), resume(), restart(), and terminate().

• Pause: pause() sets WaitingForPause status, then it checks between steps, stores the pause timestamp, transitions to Paused, and aborts the DO. If there are any pending step.do's these will finish before going to Paused.
• Resume: cancels a pending pause (WaitingForPause -> Running), or fully resumes after abort by offsetting priority queue timers by the pause duration and firing init().
• Restart: aborts the DO, then on the fresh instance reads stored INSTANCE_METADATA, cleans up SQL/KV (preserving modifier keys and mocked event data), writes fresh logs, and fires init().
• Terminate: sets status to Terminated and aborts.

Also:

• Validated step configuration.
• Aligned states table schema with production (DATETIME('now','subsec') for timestamp precision).
• WorkflowHandle.status() auto-refreshes stale DO stubs after abort.

---

• 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): Update Workflows local dev methods now working cloudflare-docs#28915
  • Documentation not necessary because:

A picture of a cute animal (not mandatory, but encouraged)

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[changeset-bot]

🦋 Changeset detected

Latest commit: ec31b51

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commit: 24dac17

[github-actions]

✅ All changesets look good

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/workflows
• ✅ @cloudflare/wrangler

Show detailed file reviewers

[emily-shen]

lgtm from the wrangler/miniflare side, can't say much about the actual workflows stuff 😅

while reviewing I noticed the readme for workflows-shared says this code is actually used by workflows infrastructure in prod, i assume that isn't actually true?

[pombosilva]

while reviewing I noticed the readme for workflows-shared says this code is actually used by workflows infrastructure in prod, i assume that isn't actually true?

Yes that readme was wrong. Thanks for warning - I updated it