lib.ExecContext: Clean up temp file in _put()

_put() writes the content into a temporary file with tee and, when
atomic is set, moves it to the target path with a final mv. The loop
over the command list sets tmp_file to None after each command, on the
assumption stated in the comment that the file has been moved at that
point - which is only true for the last command. When a chown, chmod,
or mv after the tee fails, the finally block finds tmp_file is None
and leaves the temporary file behind.

Reset tmp_file only after all commands have completed, so that the
finally block erases the temporary file whenever a step fails.

Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.84.2
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/ExecContext.py

@@ -553,7 +553,7 @@ class ExecContext(Base):
                 for cmd in cmds:
                     log(DEBUG, f'{self.log_name}: Running {pretty_cmd(cmd.cmd, wd)}')
                     ret = await __run(cmd.cmd, cmd_input = cmd.cmd_input)
-                    tmp_file = None  # Has been successfully moved at this point
+                tmp_file = None  # All commands, including the final mv, succeeded
                 return ret
             finally:
                 if tmp_file is not None: