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

FABRIC-3.md

@@ -5855,3 +5855,17 @@ That is the natural mechanism a real fix would hook, not something to build from
 with the workflow") -- find and log these live, keep the campaign running, don't stop to fix
 each one as found. Real feature, real gap, deliberately deferred.
 
+### XXXV.15 -- Extractor bug: SLOT_FMT never updated after §XXXV.12's alignment fix
+
+Found checking the real, live campaign's first two trials against the console log. Both slots
+read back as "CRC mismatch" in `extract_doe_region.py` even though the kernel-side write path
+was correct and the console log showed clean trials. Root cause: §XXXV.12's struct-alignment fix
+added an explicit `_align_pad` `uint32_t` field to `doe_trial_slot_t` (`doe_region.h`), but
+`extract_doe_region.py`'s `SLOT_FMT`/`SLOT_CRC_SPAN` were never updated to match -- every field
+after `isa` was being read from the wrong byte offset, so `slot_crc` itself was read from the
+wrong bytes entirely. Fixed (`SLOT_FMT = "<QQIIIIIII8sIQ"`, `assert SLOT_SIZE == DOE_SLOT_SIZE`
+tightened from `<=` to catch exactly this kind of drift next time). Re-extracted the real
+campaign's first two trials correctly: `run=0 cfg=0 rep=14 nw=2 mode=uniform fail=0`,
+`run=1 cfg=5 rep=8 nw=8 mode=heterogeneous fail=0`, both `fleet_conserved=1`,
+`fleet_k_q48=65536` (exactly Q48.16 1.0) -- clean so far.
+

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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
+This report reflects \textbf{2} completed trial(s) persisted via
-will populate automatically the next time this report is built after
+\texttt{DOE-PERSIST-TRIAL} as of the last extraction, spanning ISA(s)
-the campaign has produced at least one completed trial.
+\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}

experiments/bare_metal/analysis/tables/multiuser_cell_summary.csv

@@ -0,0 +1,3 @@
+"nw","mode","n_trials","n_fail","fail_rate","mean_fail_count","mean_fleet_k","pct_conserved","mean_switch_cnt"
+"2","uniform",1,0,0,0,1,1,0
+"8","heterogeneous",1,0,0,0,1,1,0

experiments/bare_metal/analysis/tables/multiuser_status.csv

@@ -1,2 +0,0 @@
-"status","trials_so_far"
-"No trials persisted yet",0

experiments/bare_metal/runs/multiuser-doe-trials.csv

@@ -1 +1,3 @@
 isa,run_id,cfg,rep,nw,mode,fail_count,fleet_k_q48,fleet_conserved,switch_count_cumulative
+amd64,0,0,14,2,0,0,65536,1,0
+amd64,1,5,8,8,1,0,65536,1,0

scripts/extract_doe_region.py

@@ -73,11 +73,13 @@ CTRL_CRC_SPAN = struct.calcsize("<QIIII")  # everything before hdr_crc
 
 # doe_trial_slot_t: fleet_k_q48(u64) switch_count_cumulative(u64)
 # run_id(u32) cfg(u32) rep(u32) nw(u32) mode(u32) fail_count(u32)
-# fleet_conserved(u32) isa(8s) slot_crc(u64), rest is padding to 64.
+# fleet_conserved(u32) isa(8s) _align_pad(u32, explicit -- see
-SLOT_FMT = "<QQIIIIIII8sQ"
+# doe_region.h's own comment on why: brings slot_crc to an 8-aligned
+# offset without relying on implicit compiler padding) slot_crc(u64).
+SLOT_FMT = "<QQIIIIIII8sIQ"
 SLOT_SIZE = struct.calcsize(SLOT_FMT)
-SLOT_CRC_SPAN = struct.calcsize("<QQIIIIIII8s")  # everything before slot_crc
+SLOT_CRC_SPAN = struct.calcsize("<QQIIIIIII8sI")  # everything before slot_crc
-assert SLOT_SIZE <= DOE_SLOT_SIZE
+assert SLOT_SIZE == DOE_SLOT_SIZE
 
 
 # CRC-64/XZ, same polynomial/algorithm as compute_crc64() in
@@ -186,7 +188,7 @@ def read_ring(dev_path: str):
             f.seek(blk_off + slot_off_in_devblock)
             raw = f.read(SLOT_SIZE)
             (fleet_k_q48, switch_count, run_id, cfg, rep, nw, mode,
-             fail_count, fleet_conserved, isa_raw, slot_crc) = struct.unpack(SLOT_FMT, raw)
+             fail_count, fleet_conserved, isa_raw, _align_pad, slot_crc) = struct.unpack(SLOT_FMT, raw)
 
             want_slot_crc = compute_crc64(raw[:SLOT_CRC_SPAN])
             if want_slot_crc != slot_crc: