Reviews: T17a–e pass

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

TASKS.md

@@ -60,7 +60,7 @@ Per-component lines live in `tasks/`. Tags there:
 - [x] T16c Finance · Quotes & book
 - [x] T16d Finance · Trading
 - [x] T16e Finance · Markets & assets
-- [ ] T17a Editor · Core
+- [x] T17a Editor · Core
 - [x] T17b Editor · Intelligence
 - [x] T17c Editor · Search
 - [x] T17d Editor · Panels
@@ -231,7 +231,7 @@ Per-component lines live in `tasks/`. Tags there:
 | T16e | 2 | PASS | |
 | T17a | 1 | FAIL | hidden numbers crashed the gutter; an edit with nothing to change tripped an assert; a read-only editor moved its caret and undid; a hint past a multi-line ghost fell off its row; the newest cursor lost the lead on merge; a slow composition left its pinyin in undo; gpui tests broke a featureless test build |
 | T17a | 2 | FAIL | a selection touching the newest caret took the lead; a composition cleared to nothing stayed open and kept later edits out of undo |
-| T17a | 3 | — | pending review |
+| T17a | 3 | PASS | |
 | T17b | 1 | FAIL | two calls of one name shared a tree key; references counted lines, not matches |
 | T17b | 2 | PASS | |
 | T17c | 1 | FAIL | a match on trailing spaces ran past its trimmed line; `**/` needed a folder |