Summary

Second removal pass for #1835. The first audit was built from git blame with move and copy detection, which credits whoever last edited a line; docstrings from the 2009 tree that later authors lightly edited were attributed to the editor and survived #1843. A blame independent check that compares the current tree textually against the 2009 pyzeroconf tree and the 2014 v0.14-wmcbrine tree found the remainder: about fifty docstrings across the library and async API that still share six word or longer runs with the original prose, the flag bit trailing comments in const.py, and two example files whose docstrings derive from the original zwebbrowse and zwebtest scripts; the two examples are deleted whole and will be recreated fresh in the follow up.

This PR is deletion only and is intentionally aggressive; every docstring containing any matching run is deleted whole rather than trimmed, so the follow up restores from a clean slate. Several public members lose their rendered API documentation until the follow up PR adds freshly written docstrings.

Test plan

• every file still parses and the suite passes; the deletions are prose only
• the textual comparison against both historical trees now reports zero matching prose spans outside the license headers, which are replaced wholesale by the relicense itself