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fix(ci): accept unbound /test e2e comments and post replies

`/test e2e core` was rejected as invalid without --head/--nonce, and the
rejection reply 403ed because the dispatcher token could not write PR
comments. Bind live HEAD when the comment omits the nonce, and grant
pull-requests: write so trusted replies and approval markers can post.

Signed-off-by: Zujian Zhang <zhangzujian.7@gmail.com>