Merge gh/main (220abc61) into fix/hv0r-jpba-relays

# Conflicts:
#	context/test-evidence/clients.md
#	crates/improvise-protocol/src/client.rs

context/test-evidence/command.md

@@ -2891,6 +2891,11 @@ The buffer is derived from each mode rather than restated in the test —
 `every_text_entry_mode_types_into_the_buffer_its_prompt_names` owns pinning what it
 should be (improvise-k8h).
 
+**Amended by improvise-fy9o.** A commit key bound to a plain command now passes only if that command, built in
+the mode with text in the buffer, emits `SetBuffer { name: <buffer>, value: "" }`
+itself. **Rival:** `CommitAndAdvance` without its head clear. Only this test
+fails, which makes it the TUI's guard against leftover text.
+
 ### minibuffer_enter_dispatches_to_a_registered_commit
 
 improvise-6t3: the three commit commands collapsed into a single
@@ -6235,8 +6240,9 @@ The buffer after `Enter` is **not** asserted. The keymap welds `clear-buffer`
 after every commit key, so it empties the buffer `EnterEditAtCursor` has just
 seeded, and the reopened editor opens blank while its captured seed is `"2"`.
 That is existing behaviour (`enter_commits_the_cell_advances_and_re_enters_editing`
-in `clients.md`). An `Enter` there with nothing typed therefore clears the landed cell,
-measured here; that is filed as improvise-fy9o rather than fixed here.
+in `clients.md`). An `Enter` there with nothing typed therefore cleared the landed
+cell. It was filed as improvise-fy9o and is now fixed (see
+`enter_enter_leaves_every_cell_unchanged`).
 
 ### `an_editor_typed_back_to_its_seed_still_writes`
 
@@ -6293,6 +6299,27 @@ flag. This test fails alone. Every other test stays green, which was the gap.
 Once improvise-fy9o re-seeds the reopened editor, a stale `touched` would make
 every untouched Tab or Enter write its seed.
 
+### `enter_enter_leaves_every_cell_unchanged`
+
+**improvise-fy9o.** The keymap welded `clear-buffer` after every commit key, so
+it blanked the editor `CommitAndAdvance` had just reopened. The next Enter then
+committed `""` and cleared the landed cell. The test presses `i`, Enter, Enter
+on the 2×2 fixture:
+- in pivot, from (1, 0);
+- in records, from (1, 2), the West row's Cost column.
+
+Every cell must be unchanged. Both cases failed before the fix, clearing
+(North, Revenue). The records case was confirmed on its own, because the loop
+stops at the first failure. **Rival:** the editing keys bound through the
+welding `.commit` again fails both.
+
+### `typing_after_the_reopen_still_writes`
+
+After `i` and Enter from (1, 0), the reopened editor must hold `"2"`, the value
+of (North, Revenue). Typing `5` and pressing Enter must then store `25`. Before
+the fix the buffer was `""`, so the typed digit replaced the value instead of
+extending it.
+
 ## `ui/project.rs` — the totals strip (improvise-wm20)
 
 ### a_ratio_columns_total_is_the_ratio_of_the_totalled_inputs