docs: drop the README limit that #274 fixed (closes #285)

The EIP-1193 error code now survives the last hop into the page, so the third standing limit in the End-to-End Tests section no longer describes the code. Verified against src/content/inpage.js (ProviderRpcError carries code and data) and tests/e2e/run.js (the page-side error is asserted, not only the wire).

TODO.md

@@ -45,6 +45,15 @@ undefined identifiers, which is how
 
 # Completed Steps
 
+- 2026-08-17: `README.md` no longer advertises a defect the wallet does not
+  have. The End-to-End Tests section listed the EIP-1193 code being dropped in
+  the last hop into the page as a standing limit of the dApp coverage; that
+  stopped being true when
+  [#274](https://git.eeqj.de/sneak/AutistMask/issues/274) landed and did not
+  touch the README. The paragraph is deleted and the two remaining limits — the
+  stubbed RPC and the unobservable toolbar popup — were checked against the
+  current `src/content/inpage.js` and `tests/e2e/` and left as they are
+  ([#285](https://git.eeqj.de/sneak/AutistMask/issues/285)).
 - 2026-08-12: EIP-1193 error codes now reach the page. `src/content/inpage.js`
   rebuilt every failure as `new Error(error.message)`, so the code the
   background produced and the content script relayed intact was dropped in the