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re: measure the boot-nav title gate — and withdraw my own diagnosis

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Last iteration I said launch_mission died because skip_intro only tests for
the title on a static frame, gated at rmse <= 1500, and that run logged 1503
and 1549 just above the cut. I also said the fix was NOT to nudge 1500 but
to measure both signals through a boot first. Measured, and the diagnosis
does not survive.

boot_trace.sh logs the two signals skip_intro decides on -- frame-to-frame
RMSE and the is_title.py green-glyph count -- through a clean boot with no
presses at all. One run, 29 samples over 484 s:

  8 samples had rmse <= 1500, so the gate OPENED eight times
  0 samples had glyph > 0, so the title was never seen

At t=145 s the RMSE was 1205, comfortably inside the threshold, and the
glyph test was called and answered zero. A frame can be perfectly static
without being the title -- the intro movie has long quiet stretches, three
reading RMSE exactly 0. So 1503/1549 were almost certainly movie frames too,
and raising the constant would have admitted two more of them.

What is left is narrower and honest: the interactive title never appeared,
rather than appearing and being missed by a threshold.

The limitation is recorded rather than buried: the tracer intended 1 s
sampling and achieved 16.9 s, because each iteration forks two screenshots,
ImageMagick compare and a fresh Python. So this does NOT prove the title
never appeared -- only that it was absent from 29 samples. A window shorter
than ~17 s falls between them. The recorded next step is to make the tracer
sample at the rate it claims before concluding anything stronger.

Artifact: docs/re/captures/boot-signal-trace.tsv.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
This commit is contained in:
Sylpheed RE agent
2026-08-25 22:42:33 +00:00
parent 501298de81
commit 608a0cc710
4 changed files with 181 additions and 19 deletions
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docs/re/captures/boot-signal-trace.tsv Normal file
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secs rmse glyph
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1 secs rmse glyph
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3 29 0 0
4 47 11264 0
5 62 0 0
6 80 3250 0
7 99 1486 0
8 115 1350 0
9 130 1512 0
10 145 1205 0
11 159 2714 0
12 171 2712 0
13 189 34429 0
14 201 30721 0
15 218 10379 0
16 234 12487 0
17 252 14940 0
18 273 23650 0
19 293 12200 0
20 308 35782 0
21 316 0 0
22 332 8713 0
23 351 21680 0
24 369 7567 0
25 386 4642 0
26 412 9647 0
27 436 6524 0
28 458 18867 0
29 476 11594 0
30 484 0 0