[PR #13457/e54b79cb backport][3.15] Build the websocket reader_c extension without the reader_c.py symlink

[patchback]

This is a backport of PR #13457 as merged into master (e54b79c).

What do these changes do?

Removes the aiohttp/_websocket/reader_c.py symlink; the extension is now compiled directly from reader_py.py using cython --module-name aiohttp._websocket.reader_c. The symlink only existed so Cython would pair the source with reader_c.pxd and emit the right module name, but after #13388 the wheel build materializes it as a regular file in site-packages, which coverage then reports as a new 0% file.

Are there changes in behavior for the user?

No runtime changes; dists no longer contain a stray reader_c.py file, reader_c only exists as the compiled extension.

Is it a substantial burden for the maintainers to support this?

No, it is one less special case; the Makefile rule is the only thing that changed.

Related issue number

Follow up to #13388

Checklist

• I think the code is well written
• Unit tests for the changes exist
  • N/A, build tooling only, covered by the existing websocket test suite with extensions enabled
• Documentation reflects the changes
  • N/A
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • N/A, already listed
• Add a new news fragment into the CHANGES/ folder
  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

Drafted with Claude Code; reviewed by bdraco.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete build, runtime, packaging, or security failure identified.

The changed build rule preserves the extension name expected by setup and imports, while the existing distribution pipeline generates the C source before packaging; no actionable regression remains.

_{Reviews (1): Last reviewed commit: "Build the websocket reader_c extension w..." | Re-trigger Greptile}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (7977dcf) to head (9912337).
⚠️ Report is 1 commits behind head on 3.15.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.15   #13469      +/-   ##
==========================================
+ Coverage   95.66%   96.20%   +0.54%     
==========================================
  Files         160      159       -1     
  Lines       51183    50894     -289     
  Branches     2828     2771      -57     
==========================================
- Hits        48964    48963       -1     
+ Misses       2039     1751     -288     
  Partials      180      180              

Flag	Coverage Δ
CI-GHA	96.17% <0.00%> (+0.54%)	⬆️
OS-Linux	95.95% <0.00%> (+0.54%)	⬆️
OS-Windows	93.68% <0.00%> (+0.52%)	⬆️
OS-macOS	95.13% <0.00%> (+0.54%)	⬆️
Py-3.10	95.30% <0.00%> (+0.53%)	⬆️
Py-3.11	95.58% <0.00%> (+0.53%)	⬆️
Py-3.12	95.66% <0.00%> (+0.54%)	⬆️
Py-3.13	95.65% <0.00%> (+0.55%)	⬆️
Py-3.14	95.74% <0.00%> (+0.54%)	⬆️
Py-3.14t	94.75% <0.00%> (+0.53%)	⬆️
Py-pypy-3.11	94.61% <0.00%> (+0.53%)	⬆️
VM-macos	95.13% <0.00%> (+0.54%)	⬆️
VM-ubuntu	95.95% <0.00%> (+0.54%)	⬆️
VM-windows	93.68% <0.00%> (+0.52%)	⬆️
cython-coverage	78.05% <0.00%> (+<0.01%)	⬆️

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