Fix extract_doe_region.py SLOT_FMT drift; regenerate report with real data

FABRIC-3.md §XXXV.15. §XXXV.12 added an explicit _align_pad field to
doe_trial_slot_t to fix a struct-alignment bug, but never updated the
Python extractor's SLOT_FMT/SLOT_CRC_SPAN to match -- every field after
isa was read from the wrong byte offset, so slot_crc read wrong bytes
entirely and every legitimate record (including the real, live
campaign's own first two clean trials) was flagged as CRC-corrupt.
Fixed; SLOT_SIZE assertion tightened from <= to == to catch this drift
immediately next time.

Regenerated multiuser_doe_report.pdf against the real campaign's actual
first two trials: run=0 (cfg=0, nw=2, uniform, fail=0) and run=1 (cfg=5,
nw=8, heterogeneous, fail=0), both fleet_conserved=1 at exactly Q48.16
1.0. Real report, real data, first time this has happened for this
campaign. disk/artemis.img itself and the live campaign's log directory
are deliberately left uncommitted -- still being written by the running
campaign.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BWpNjdwPtFLuVLaAq44L9K

experiments/bare_metal/analysis/report/sections/multiuser_summary_autogen.tex

@@ -1,4 +1,11 @@
 % Auto-generated by analyse_multiuser_doe.R -- do not edit by hand.
-No trial data has been persisted to the DoE region yet. This section
-will populate automatically the next time this report is built after
-the campaign has produced at least one completed trial.
+This report reflects \textbf{2} completed trial(s) persisted via
+\texttt{DOE-PERSIST-TRIAL} as of the last extraction, spanning ISA(s)
+\texttt{amd64}. Overall fail rate across all trials so far is
+\textbf{0.0\%}; \textbf{100.0\%} of trials read
+\texttt{fleet\_conserved==1} at trial end.
+
+\begin{itemize}
+  \item 2 workers, uniform: 1 trials, fail rate 0.0\%, mean fleet K = 1.0000
+  \item 8 workers, heterogeneous: 1 trials, fail rate 0.0\%, mean fleet K = 1.0000
+\end{itemize}