issue-comment.sh called the non-existent `tea issue comment` subcommand
form; tea 0.11.1 silently no-ops and exits 0 instead of erroring, producing
a false-success write. Switch to the top-level `tea comment <index> <body>`
form and add fail-closed REST read-back verification so the wrapper no
longer trusts tea's exit code alone.
pr-review.sh's comment path was already fixed for this bug by #812/#835
(routes through a read-back-verified REST comment API instead of any
tea comment subcommand); this change formalizes an explicit --login
override flag there too and documents the after-detection last-wins
--login ordering, consistent with issue-comment.sh.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
