Python: fix(ag-ui): persist workflow HITL user text in thread snapshots

[LI (ktz03)]

Description

Fixes #8160. Workflow AG-UI resumes often send messages: [] and put the user reply in resume.interrupts[].value. Execution continued, but the Thread Snapshot never recorded that turn, so hydrate skipped the user text.

After resume_seeded_messages, fold user-visible resume values (message lists / plain text) into the snapshot builder seed. Approval-style payloads (approved/accepted/functionCall) are skipped.

Validation

• test_workflow_hitl_resume_persists_user_text_in_thread_snapshot

[Copilot]

🟡 Changes recommended

Resume synthesis can persist approval strings and duplicate user turns.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Persists workflow HITL resume text in AG-UI thread snapshots for correct hydration.

Changes:

• Converts conversational resume values into snapshot messages.
• Adds regression coverage for message-list resumes.

File summaries

File	Description
_workflow.py	Adds resume-value snapshot synthesis.
test_workflow_agent.py	Tests HITL text persistence.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 2
• Review effort level: Balanced

---

💡 Add a code-review agent skill for context-aware, tailored reviews. Learn more in the docs.

[LI (ktz03)]

Fork CI for this PR may need a maintainer to Approve workflows before Python tests run (same as other community PRs). Happy to address review feedback once checks appear.

[LI (ktz03)]

Follow-up for Copilot review: skip bare approval/rejection resume strings as user turns, and dedupe resume-synthesized snapshot messages against incoming messages. See b04c2ea.

[lsmlhi_25 (FOWEPJF255)]

Checks look good. Persisting the HITL user text from resume.interrupts[].value into the Thread Snapshot closes a real hydrate gap for workflow AG-UI resumes with empty messages.

If anything is still blocking review on #8160, happy to dig in.