fix(temporal): unblock Get/Events on run timeout and terminate workflows on close

[vinodvx]

Description

• Unblock Get / Events when a run hits WithTimeout or Stream/Run deadline (no per-call waiter deadlines required); emit a clear timeout error instead of hanging.
• Stop stuck Temporal workflows on timeout (terminate) and on agent Close (parallel terminate with reason agent closed).
• Keep Get / Events / reconnect ctx cancel as waiter-only; run cancel stays on Stream/Run ctx, WithTimeout, or explicit Cancel().
• Move stream approvals to AgentStream.Approve (deprecates Agent.OnApproval); update docs and durable_agent scenario notes.

Test plan

• go test ./internal/runtime/temporal/ ./pkg/agent/
• durable_agent scenario 2: agent, no worker → fail-fast or context deadline exceeded (no hang / late canceled)
• Stream with WithTimeout: Events on Background still gets terminal timeout error
• Agent Close with active runs: workflows terminate; process exits within Close timeout

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

[codecov]

Codecov Report

❌ Patch coverage is 69.49153% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/runtime/temporal/stream_handle.go	61.70%	17 Missing and 1 partial ⚠️
internal/runtime/temporal/runtime.go	70.37%	13 Missing and 3 partials ⚠️
internal/runtime/temporal/run_handle.go	88.23%	1 Missing and 1 partial ⚠️

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