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1bc2e0722d
* feat(flows): add now() to the CEL expression environment
CEL expressions in flow definitions had no way to produce the current
date: the environment was built bare, so date-dependent flows failed at
runtime. Register a now() function that returns the current UTC time as
a CEL timestamp. The value is frozen once per kickoff so every
expression in a run sees the same instant, even across midnight.
Standard CEL covers formatting from there: string(now()),
now().getFullYear(), now() - duration('24h').
* chore(flows): drop redundant comment on _cel_now
* refactor(flows): derive CEL env and functions from one registry
A function now lives in one _CelFunctionSpec entry: its annotation for
compile and its implementation factory for evaluate, so the two cannot
drift. Run-scoped values move into _CelRunContext; adding one is a
field, not a new parameter through every helper signature.
* chore(flows): drop _CelRunContext docstring
* fix(flows): freeze a fresh cel now() on human-feedback resume
resume_async never passes through kickoff_async, so a flow restored
with from_pending() had no frozen instant and now() fell back to live
wall-clock per expression. Freeze a fresh instant at resume instead of
persisting the kickoff one: a flow can pause on feedback for days, and
expressions after resume must see today.