Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc2+` (`3.14`) was **published** on 2025-08-18 21:21:55+00:00.

# Commit Info

Base: (`3.14.0rc2+`) - `c9e2e15438839c9259997bcde4e366adc802d8c5` (commit date: 2025-08-18 11:07:47+00:00)
Imported: (`3.14.0rc2+`) - `3.14` (commit date: 2025-08-18 21:21:55+00:00)

# Files added

```javascript
Misc/NEWS.d/next/Library/2025-08-18-16-02-51.gh-issue-134869.GnAjnU.rst
```

Reviewed By: itamaro

Differential Revision: D80529970

fbshipit-source-id: e37fb1301ff64bfa74b494532b7bf0cef3e3a51d

Author: generatedunixname1734921407115435

Lib/_pyrepl/simple_interact.py

@@ -158,6 +158,7 @@ def maybe_run_command(statement: str) -> bool:
             input_n += 1
         except KeyboardInterrupt:
             r = _get_reader()
+            r.cmpltn_reset()
             if r.input_trans is r.isearch_trans:
                 r.do_cmd(("isearch-end", [""]))
             r.pos = len(r.get_unicode())

Misc/NEWS.d/next/Library/2025-08-18-16-02-51.gh-issue-134869.GnAjnU.rst

@@ -0,0 +1 @@
+Fix an issue where pressing Ctrl+C during tab completion in the REPL would leave the autocompletion menu in a corrupted state.