Report a projection stage, an evidence ladder and the sustained-regime
write rate from compute_projection, per ADR 0012. A provisional lifespan
appears after 3 observed hours and carries the hours observed and a
short-horizon spread; the complete-local-day condition becomes a fact
instead of a gate, and the write rate replaces the lifespan when no
baseline applies. The TUI and CLI render the stage, ladder count and
full ladder, and drop their own two-sample pre-gates.
Use lifetime written bytes from the current segment's newest published
sample in the headline formula, select the Percentage-Used-implied
baseline after two increments in the segment (otherwise show the
too-coarse fact), and judge horizon agreement across existing horizons.
Make the vacuous projection tests assert unconditionally and add
coverage for implied-baseline gating and single-horizon agreement.
xavierk