feat: refactor agent run/stream handles for Temporal Workflow Streams and crash recovery

[vinodvx]

Description

Refactor agent run/stream handles for Temporal Workflow Streams and crash recovery.

• Run / Stream return AgentRun / AgentStream handles (Get, Done, Status, Cancel, Events)
• Remove RunAsync / AgentRunAsyncResult; stream options move to AgentStreamOptions
• Temporal: durable Workflow Streams on AgentWorkflow (replaces separate event workflow); drop EnableRemoteWorkers()
• Crash recovery via GetAgentRun / GetAgentStream + WithOffset (Temporal); LocalRuntime fails fast with ErrRunNotFound / ErrStreamNotFound
• Conversation constructors: NewConversation only (NewInMemoryConversation / NewRedisConversation removed)

Test plan

• Blocking Run + Get
• Non-blocking Run (Done / Status / Cancel)
• Stream + Events
• Temporal reconnect: GetAgentRun / GetAgentStream + WithOffset
• LocalRuntime reconnect returns not-found errors
• Examples and docs build / run for touched paths

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

close #53

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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Project	Status	Preview	Updated (UTC)
agent-sdk-go	🟢 Ready	View Preview	Jul 26, 2026, 7:42 AM

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[codecov]

Codecov Report

❌ Patch coverage is 68.78347% with 408 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/runtime/temporal/runtime.go	63.78%	114 Missing and 16 partials ⚠️
internal/runtime/temporal/agent_workflow.go	43.30%	115 Missing and 12 partials ⚠️
internal/runtime/temporal/stream_handle.go	55.55%	48 Missing and 4 partials ⚠️
internal/runtime/local/runtime.go	80.85%	21 Missing and 6 partials ⚠️
pkg/agent/agent_stream.go	60.86%	10 Missing and 8 partials ⚠️
pkg/agent/agent_run.go	57.57%	8 Missing and 6 partials ⚠️
pkg/agent/agent.go	89.13%	9 Missing and 1 partial ⚠️
eval-harness/runner/runner.go	50.00%	3 Missing and 3 partials ⚠️
internal/types/agent.go	0.00%	6 Missing ⚠️
internal/events/events.go	0.00%	5 Missing ⚠️
... and 8 more

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Project	Status	Preview	Updated (UTC)
agent-sdk-go	🟡 Building	–	Jul 26, 2026, 7:41 AM

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