Summary

• FlowRunner was passing raw user inputs to the execution context without applying declared default values from input definitions
• When executeFlow received a resumeState (which FlowRunner.execute() always provides), it skipped its own default resolution at lines 816-824
• Fix: resolve defaults in the FlowRunner constructor so this.state.inputs has defaults applied before context creation

Test plan

• Create a flow with optional inputs that have default values
• Execute without providing those inputs — verify defaults are used (not undefined)
• Execute providing those inputs — verify provided values take precedence over defaults
• Resume a paused flow with default inputs — verify defaults persist

Closes #6

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