feat: add execution config for per-operation timeouts and max attempts and trim down main README

[vinodvx]

Description

Per-operation timeout and max attempts for agent loop operations. Users override only what they need via With*ExecutionConfig; zero fields keep SDK defaults.

• User-facing ExecutionConfig (Timeout, MaxAttempts) on agent creation
• Internal ExecutionPolicy with resolved values and backoff for runtime use
• Overrides per operation: LLM, tool auth, tool execute, MCP, A2A, retriever, memory, conversation, sub-agent
• Sub-agent timeout falls back to agent run timeout (WithTimeout) when not set
• Same behavior on local and Temporal runtimes

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

Closes #39

Checklist

• I have run make check
• I have run task examples:all
• I have run make 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

[mintlify]

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Project	Status	Preview	Updated (UTC)
agent-sdk-go	🟢 Ready	View Preview	Jul 7, 2026, 3:18 AM

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[codecov]

Codecov Report

❌ Patch coverage is 78.92857% with 59 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/runtime/local/agent_loop.go	75.75%	37 Missing and 3 partials ⚠️
internal/runtime/temporal/agent_workflow.go	67.30%	15 Missing and 2 partials ⚠️
internal/runtime/runtime.go	95.34%	1 Missing and 1 partial ⚠️

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