Slice 2. 588 green, 0 warnings.
- `FramePumpStats` and `FramePump.StatsReported`: the 5 s window the log line already describes, as
data. `Dropped` is the ENCODER's counter (frames submitted, not accepted); `Stalls`/`AvgRenderMs`
are the pump's. `FramesRendered` is deliberately not used for classification — a static scene
reuses the paste cache and renders few frames while completely healthy, so it would read as
starvation.
- `StepDownPlanner`: one per broadcast, owns the stateful policy, converts stats → sample, exposes the
landed tier for the restart. It never acts — the VM owns the effects, which is what keeps the ladder
testable without an encoder.
- `Describe` / `ReportLine`: the sentences a creator sees. Machine cause says LlamaCasty couldn't keep
up and the connection was not the problem; upload cause blames the upload and promises no further
thrash. A test asserts the machine copy never leaks "dropped" — mechanism strings stay in the log.
Remaining for the task: VM subscription, the encoder restart at the landed tier, the toast, and
shedding our own capture cost before stepping fps.
