spec: shiroa fixes

[RobinJadoul]

• Strip raw blocks from chapter titles for project argument
• Add an explicit description (based on chapter title) to chapters to avoid compilation issues when context appears early in the chapter
• Export interaction counts from the pdf version to use in shiroa, since otherwise we run into convergence issues that are hard to debug

[github-actions]

Codex Code Review

Findings:

• Medium: spec/build_shiroa.sh assumes the current working directory is spec/. If someone runs it as spec/build_shiroa.sh from the repo root, typst query ebook.typ ... will resolve the wrong path, and the matching rm -f interaction_count.json at line 7 can delete/create the file in the caller’s cwd instead of alongside the script. This is a real build regression; the script should cd to its own directory or use script-relative paths.

• Medium: spec/book.typ:187 makes every Shiroa build depend on an out-of-band generated file, interaction_count.json. The new wrapper script generates it, but nothing in book.typ enforces that path, so any existing workflow that still runs shiroa build directly now fails. Worse, if a stale interaction_count.json is present locally, the site can build with outdated interaction counts silently. This should either be wired into the canonical build entrypoint more defensibly or validated explicitly.

No security issues stood out in this diff. I couldn’t run the Typst/Shiroa build locally because typst and shiroa are not installed in this environment.

[claude]

Review: spec/shiroa-fixes

This PR fixes three concrete shiroa build problems (raw in titles, missing chapter descriptions, interaction-count convergence). No security issues; no VM/crypto logic touched.

Two minor notes left as inline comments:

1. build_shiroa.sh - no cleanup of interaction_count.json if shiroa build fails (trap suggestion inline).
2. book.typ line 187 - json() gives a cryptic file-not-found if shiroa build is run directly without the two-phase script (DX note inline).

Everything else looks good:

• show ref: none inside xref-include correctly suppresses ref rendering in invisible cross-ref includes.
• Moving show ref outside project.with() is the right fix so the rule covers the title/description scope too.
• .flatten() to .sum(default: ()) is the correct Typst API migration.
• The two-phase design (PDF query to JSON to shiroa) cleanly avoids the convergence issue.
• set_nr_interactions returning early for shiroa builds is consistent with reading precomputed JSON.

[erik-3milabs]

Just as a safety precaution

Suggested change

	shiroa build
	RAYON_NUM_THREADS=1 shiroa build

Also, this stuff still freezes my PC due to RAM usage :(

[RobinJadoul]

idk if that should be a default in the build script, vs being set in your local env. It would also make the builds slower when the memory is not a restriction.
I could add a build_shiroa_slow.sh that adds the flag?

[erik-3milabs]

Perhaps a better solution would be to allow the number of threads to be passed as a parameter/have a flag to enable multi-threading, where in the script it is documented that this might be a tricky thing to do. And then print a message at start such as

Starting shiroa build on X threads...

when executing to indicate what is happening & suggest to people new to the script that they can multi-thread the process.

Given that (even with THREADS=1) this program often crashes my PC (which has a not unreasonably low 16GB of RAM), I think that we should be cautious to enable multi-threading by default.