Adds the agentic 'loop' to flows: flow.Loop(body, opts...) is a StepFunc
that runs a body step repeatedly, carrying State across passes, until a
stop condition fires or a hard iteration cap is reached.
- Stop modes: flow.Until (code-defined predicate) and flow.UntilLLM (the
model judges the goal met after each pass — the supervised 'Ralph'
loop). Either firing stops the loop.
- flow.LoopMax is the guardrail: the body never runs more than n times, so
the loop always terminates and can't run up an unbounded bill. Hitting
the cap returns the latest state rather than erroring.
- flow.OnIteration reports per-pass progress.
- Composes as a normal flow step (checkpointed by the step engine).
- Exposed at the top level as micro.FlowLoop / FlowUntil / FlowUntilLLM /
FlowLoopMax / FlowOnIteration, symmetric with the other Flow* helpers.
Includes tests, an offline runnable example (examples/flow-loop), an
'Agent Loops' guide, and a CHANGELOG entry.
Claude-Session: https://claude.ai/code/session_01CmdEY7pYmV5zzwCjNJ4ykL
Co-authored-by: Claude <noreply@anthropic.com>
Asim Aslam
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