chore(tor): move the onion service from alpha to beta

lifecycle is a selection axis rather than a label: cli/meta/ci/validate.py
hands --lifecycles to matrix.entries_of, so a run whose envelope admits beta
but not alpha picks svc-net-tor up from now on. Recent sweeps ran with an empty
envelope and are unaffected.

The maturity call is the operator's; this commit only records it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

roles/svc-net-tor/meta/services.yml

@@ -39,4 +39,4 @@ tor: # nocheck: category-modes
   mem_reservation: 128m
   mem_limit: 256m
   pids_limit: 128
-  lifecycle: alpha
+  lifecycle: beta