refactor(runtime): propagate invoke SDK errors

[aidandaly24]

Summary

• rethrow IAM InvokeAgentRuntime SDK failures without wrapping or rebuilding their diagnostics
• let the existing root error boundary classify headless failures
• preserve direct ServiceException metadata for structured TUI rendering
• remove Runtime-specific logger plumbing and speculative redaction tests

Follow-up to the error-boundary review comments on #1930.

Testing

• bun test src/core/core.test.ts src/handlers/runtime/invoke/invoke.screen.test.tsx src/handlers/runtime/invoke/invoke.test.tsx (85 pass)
• bun run typecheck
• bun run lint:check
• bun run format:check
• TUI Harness: headless invalid session surfaced the original AWS validation message
• TUI Harness: interactive invalid session retained structured type, HTTP status, message, and request ID
• bun test src reached 816 pass; the only two failures were unchanged src/io/exec.test.ts subprocess-output assertions that reproduce in this environment

[AlexanderRichey]

Do these errors need to be wrapped with AgentCoreCLIError.fromError(error) with the relevant settings so we know the error was a service error?

[aidandaly24]

Good question. Headless failures are already converted through AgentCoreCLIError.fromError in the root catch, which recognizes ServiceException and assigns the appropriate error source. The TUI consumes the original exception directly for structured rendering, so I think wrapping it inside Core would duplicate that boundary.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.68%. Comparing base (7e29eda) to head (827d3b3).

Additional details and impacted files

@@             Coverage Diff              @@
##           refactor    #1937      +/-   ##
============================================
- Coverage     96.69%   96.68%   -0.01%     
============================================
  Files           291      291              
  Lines         16012    15980      -32     
============================================
- Hits          15483    15451      -32     
  Misses          529      529              

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