Lab #2391: Docs: CEL expressions manual page - steps.<name>.outputs semantics and non-existent startedAt/completedAt fields

What changed

swamp-club#2386 fixes steps.<name>.outputs, which was never populated for model_method steps. The page that documents it, content/manual/reference/cel-expressions.md (the steps namespace section), needs two corrections.

1. Describe what `outputs` contains

The table currently says steps.<name>.outputs is "Step output values, if the step produced any". After the fix it should say:

outputs is the flat merge of the attributes of every JSON resource the step wrote. If two resources share an attribute name, the later one wins. For keyed access to a specific resource instance, use model.<model>.resource.<spec>.<instance>.attributes.
Non-JSON resources and file outputs contribute nothing.
A step that ran a nested workflow exposes its child's outputs as steps.<parent-step>.outputs.<child-step>.<attr>, one level deep only (grandchild workflows are not propagated).
Step outputs are not stored on the run record. On resume and in swamp workflow history get/outputs they are read back from the datastore, so ephemeral-lifetime data, garbage-collected versions, or an uncached remote datastore yield no outputs.

2. Remove fields that do not exist

The same table lists steps.<name>.startedAt and steps.<name>.completedAt, and the example uses steps.build.completedAt. The steps context only exposes status and outputs (StepContext in src/domain/expressions/model_resolver.ts), so these references fail with No such key. Remove them from the table and the example.

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1. Describe what `outputs` contains