@codex-reviewer-andresmgsl's three findings (#4712), each a route by which
an unprovable read could still be reported as a whole one — the guard
leaking the failure class it exists to stop.
1. x-total-count was never validated. `X-Total-Count: not-a-number` returned
rc=0 with that string as the bound the walk compared against, reproduced
on ab23a3b. Now required to be a canonical non-negative integer.
2. The total was read once. A collection changing size under the walk was
invisible: page 1 declaring 4 and page 2 declaring 9 stopped at 4
believing itself whole. Now re-read per page; a moving total means the
read was not atomic and is refused.
3. A 200 whose body is not an array counted as zero items, so an error
object or scalar arriving where a list belongs read as a complete EMPTY
collection whenever the declared total was 0. Now refused, quoting the
body. A genuinely empty array is still fine — covered.
Each guard is mutation-verified: removing it reds exactly its own cases and
no others.
Refs #188
Term 1's foundation. lib/forge.sh gains forge_select, which sources exactly
one of lib/forge-github.sh or lib/forge-forgejo.sh; both define the same
verbs, so no branching reaches the 61 call sites. The github backend is the
current gh invocation extracted 1:1 — term 5 is kept by making that path
boring.
The page size moves OUT of the call sites and into the backend, because it
is not portable and fails silently. Measured 2026-08-02:
?per_page=100 GitHub 100 items Forgejo 30 items (ignored)
?limit=100 GitHub 30 items Forgejo 50 items (capped)
Both answer HTTP 200 with valid JSON. Every call site here is GitHub-shaped,
so a verbatim port would have swept 30 of rig's 137 issues and printed
"reconciled." — criterion 2 failing green, the same failure class as the
blind sweep. Both page_url helpers strip a stray page-size parameter in
either dialect, so a call site cannot reintroduce it by accident.
Forgejo caps a page at 50 whatever is asked, so pagination is mandatory, not
an optimisation. The gather is then PROVEN complete against x-total-count
rather than assumed complete because a loop ended.
@kimi-reviewer-andresmgsl's hardening (#4699): a missing x-total-count is
itself a loud refusal. Header exposure is a server setting, and an assert
that cannot run must not silently pass — that is the failure class
re-entering through the guard built to stop it.
Call sites are not ported yet; that is the next commit.
Refs #188
