Upstream sync: no-op (Python-only changes, 2026-02-23)

[Copilot]

3 upstream commits since last merge — all Python SDK build tooling changes (manylinux tag bump, setuptools cleanup, PEP 639 license migration). No .NET source, test snapshot, protocol, or doc changes.

Changes

• .lastmerge — advanced to c4b3b366c4bd8dfba9ba4aa05e4019825360ad78

Not ported

Commit	Reason
c4b3b36 Bump manylinux tag for Node 24.11	Python/CI only
c884332 Clean up setuptools / lock files	Python packaging only
93a3f71 PEP 639 license-files migration	Python packaging only

Original prompt

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This section details on the original issue you should resolve

<issue_title>Upstream sync: 3 new commits (2026-02-23)</issue_title>
<issue_description>## Automated Upstream Sync

There are 3 new commits in the official Copilot SDK since the last merge.

• Last merged commit: c263dfc69055f9f28ee2d4b121cf617fca5a42dc
• Upstream HEAD: c4b3b366c4bd8dfba9ba4aa05e4019825360ad78

Recent upstream commits

c4b3b36 Bump manylinux tag to glibc 2.28 for Node 24.11 (#428)
c884332 fix(python): clean up setuptools usage and drop redundant/unnecessary lock files (#449)
93a3f71 python: migrate to PEP 639 license-files (#456)

Instructions

Follow the agentic-merge-upstream prompt to port these changes to the Java SDK.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Upstream sync: 3 new commits (2026-02-23) #145

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