Task: Add a strict missing-page check for the site build

TASK-DESCRIPTION

Create: scripts/site-verify.sh

Create scripts/site-verify.sh as a POSIX shell script that checks the generated site. For every site.in/*.txt input file, it must confirm that site.out/<name>.html exists, following the page mapping in prompts/features/01-site-build.md. Report each missing page on standard output, one page path per line. Accept optional input and output directory arguments; with no arguments, use site.in/ and site.out/ relative to the repository root, mirroring scripts/site-build.sh. Without --strict, report missing pages and exit 0. With --strict, exit nonzero when any generated page is missing.

TASK-OUTPUT

Report the created file and the verification result.
End with the VERIFICATION: line.

TASK-CONTEXT

Feature requirements: prompts/features/01-site-build.md.
Conventions: prompts/03-conventions.md.

TASK-FILES

Operation	Path
create	`scripts/site-verify.sh`

TASK-VERIFY

Run: make site && sh scripts/site-verify.sh --strict from the repository root.
Expected: exit status 0.
Run: rm -f site.out/index.html && sh scripts/site-verify.sh --strict from the repository root.
Expected: nonzero exit status and a line naming site.out/index.html.

TASK-FEATURES

prompts/features/01-site-build.md

TASK-ACCEPTANCE

SITE-BUILD-R009

OUTPUT: the created file and the verification result, ending with the VERIFICATION: line.