Run build & twine upload in afterPublish instead of afterRelease

auto's exec plugin passes every hook argument as a JSON-encoded ARG_<n>
environment variable.  afterRelease's single argument carries all commits
in the release (with a full GitHub user record per PR commit), the release
notes and the GitHub release response, so for larger releases it exceeds
Linux's 128KiB per-string limit (MAX_ARG_STRLEN) and the command fails
with "spawnSync /bin/sh E2BIG" before it even starts, although
"python -m build && twine upload dist/*" never uses it
(intuit/auto#1294).

afterPublish takes no arguments, so no ARG_* variables are set.  It runs
in "auto shipit" right after git-tag has created and pushed the new tag,
so the version derived from the tag is the same; the only difference is
that PyPI upload now happens before, rather than after, the GitHub
release is created.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W872omgTVzywQbbjRvCX6q

Author: claude

.autorc

@@ -9,7 +9,7 @@
         [
             "exec",
             {
-                  "afterRelease": "python -m build && twine upload dist/*"
+                  "afterPublish": "python -m build && twine upload dist/*"
             }
         ],
         "released"