chore: prune landed remote branches (closes #167)

Eighteen branches on origin that the issue classifies as landed, or
superseded by merged pull requests, were deleted; the evidence for each
is on the issue. Four whose work is not in next are kept: the three
issue 87 error-display branches, reference for issue 493, and
chore/token-list-enrichment, re-created at f7a2437, pending issue 495.
TODO.md records this.

The branch-pruning Future Step had already left TODO.md in the issue 191
rewrite, so only the Completed Steps entry is added.

Model: opus-5-5

TODO.md

@@ -45,6 +45,21 @@ but the review is broader than any of them.
 
 # Completed Steps
 
+- 2026-10-07: Stale branches pruned from `origin`
+  ([#167](https://git.eeqj.de/sneak/AutistMask/issues/167)). The issue
+  classifies each branch it lists, with the evidence. The eighteen still on
+  `origin` that it classifies as landed, or superseded by merged pull requests,
+  were deleted. `feat/message-signing` and `fix/59-transaction-view-ui-policies`
+  had been deleted on 2026-09-09; both landed and stay deleted. Four are kept
+  because their work is not in `next`: `fix/consistent-error-display`,
+  `fix/87-consistent-error-display` and `fix/87-consistent-error-display-v2`,
+  the change for [#87](https://git.eeqj.de/sneak/AutistMask/issues/87) that
+  never landed, as reference for
+  [#493](https://git.eeqj.de/sneak/AutistMask/issues/493); and
+  `chore/token-list-enrichment`, deleted on 2026-09-09 and re-created at
+  `f7a2437`, whose `scripts/` tooling waits on
+  [#495](https://git.eeqj.de/sneak/AutistMask/issues/495).
+
 - 2026-10-07: The README says that the wallet never clears the clipboard after
   the private key or the recovery phrase is copied, and why
   ([#492](https://git.eeqj.de/sneak/AutistMask/issues/492)): the clipboard is