Fix/temporal close preserve workflows

[vinodvx]

Description

• Stop terminating active Temporal workflows on Agent.Close / runtime Close so runs stay durable across worker/agent restarts
• Update docs (Close / Temporal durability) and Agent Chat reference-app page to match
• Fix Close unit tests to assert workflows are not terminated

Test plan

• go test ./internal/runtime/temporal/ -run Close_Active
• Restart agent/worker mid-run and confirm workflow continues in Temporal UI

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Refactor / chore

Related issues

Checklist

• I have run task check
• I have run task examples:all
• I have run task tidy if I added or removed dependencies
• Commit messages follow conventional commits (e.g. feat:, fix:, docs:)
• I have added/updated tests for my changes
• Documentation is updated if needed

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✅ All modified and coverable lines are covered by tests.

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Project	Status	Preview	Updated (UTC)
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