Found by the ChatGPT Codex review of PR #151 at head 64bcb82, and correct.
`clear-cell`, `yank`, `paste` and `drill-into-cell` are registered with
`register`, and their INTERACTIVE arms took `|_args, ctx|`: they discarded the
arguments and used `ctx.cell_key()`. That was harmless while a script only ever
reached the pure arm, which reads the coordinates. The moment the headless loop
re-parsed interactively, `clear-cell Region/East` passed the syntax gate and
then cleared whatever the cursor was sitting on — the origin, `Region/North`.
So this ticket's own lesson has a third instance, inside its own fix: two
construction arms that mean different things demote whichever caller reaches the
weaker one, and here the "weaker" one was the arm that had the context. The four
arms now go through `key_from_args_or_cursor` — explicit coordinates win, the
cursor is the fallback, which is what the keymap path wants anyway since a
binding carries no arguments.
`an_explicit_coordinate_still_beats_the_cursor` writes three cells and clears
the one the cursor is NOT on, so it separates "cleared the named cell" from
"cleared the cursor cell". Restoring the arg-discarding arm fails it.
Evidence: context/test-evidence/cli.md.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FC2jVn8Au7E9JPkw6bwXXH
Edward Langley
b855faf3c5