amd_s2idle: fix fchown called on closed file descriptor

[Copilot]

os.fchown was called after the with os.fdopen(fd, ...) block exited, at which point fd is already closed — raising OSError: [Errno 9] Bad file descriptor whenever SUDO_UID/SUDO_GID were set and a report filename was provided.

Changes

• src/amd_debug/sleep_report.py — Move fchown call inside the with os.fdopen(...) block so fd remains valid:

# Before — fchown executes after fd is closed
with os.fdopen(fd, "w", encoding="utf-8") as f:
    f.write(template.render(context))
if "SUDO_UID" in os.environ:
    os.fchown(fd, ...)  # OSError: bad file descriptor

# After — fchown executes while fd is still open
with os.fdopen(fd, "w", encoding="utf-8") as f:
    f.write(template.render(context))
    if "SUDO_UID" in os.environ:
        os.fchown(fd, ...)

• src/test_sleep_report.py — Add test_build_template_fchown_called_while_fd_open: sets SUDO_UID/SUDO_GID, calls build_template with a real temp path, and asserts fchown is invoked with the correct uid/gid.

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.33%. Comparing base (eb5705c) to head (e84d638).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/amd_debug/sleep_report.py	50.00%	0 Missing and 1 partial ⚠️
src/test_sleep_report.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   85.19%   85.33%   +0.14%     
==========================================
  Files          36       36              
  Lines        8119     8136      +17     
  Branches      766      767       +1     
==========================================
+ Hits         6917     6943      +26     
+ Misses        980      971       -9     
  Partials      222      222              

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