ci: monotonic prerelease versions + serialize CI on shared runner

Two CI hygiene fixes uncovered while validating against the live fleet.

1. Same-day prerelease packages were being ordered by RPM-vercmp's
   alpha-vs-digit precedence on the git SHA fragment, not by commit
   chronology. With release stamps like "0.1.${YYYYMMDD}git${SHA}",
   two commits on the same day produce the same numeric prefix and
   rpmvercmp falls back to comparing the alphanumeric SHA suffixes,
   where digit-leading SHAs are ranked above alpha-leading ones —
   completely unrelated to which commit landed first. Verified with
   rpmdev-vercmp:
     gitabc1234 < gitdef5678   (old scheme — purely lexicographic)
   Bumping the timestamp prefix to second-precision (%Y%m%d%H%M%S)
   makes the numeric prefix strictly monotonic for any chronologically-
   ordered commits, so the SHA fragment becomes a debug identifier
   only — never participates in version ordering.

2. ci.yml and build-prerelease.yml both target the `rust` runner label
   and both auto-trigger on push to main. The act-based runner reuses
   /root/.cache/act/<hash>/hostexecutor/ across concurrent jobs, so
   ci.yml's clippy and build-prerelease.yml's build-cortex were racing
   each other's checkout/cleanup steps and corrupting in-flight
   compile artifacts. Real fix is in gongfoo; workflow-level workaround
   is a shared concurrency group with cancel-in-progress=false so the
   two workflows queue sequentially on the same ref.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

rpm/helexa-neuron-prerelease.spec

@@ -9,7 +9,11 @@
 #   neuron_version    e.g. "0.1.16"
 #   neuron_flavour    e.g. "ada", "blackwell"  — matches the CI build
 #                     matrix's compute_cap label.
-#   neuron_prerelease e.g. "0.1.20260518gitabcdef0"   (used as Release)
+#   neuron_prerelease e.g. "0.1.20260518140530.gitabcdef0"
+#                            ^^^^^^^^^^^^^^^^^^ ^^^^^^^^
+#                            commit time (sec)  commit sha
+#                           (used as Release; the timestamp prefix
+#                            keeps same-day builds strictly ordered.)
 #
 # One flavour can be installed at a time on a given host; flavour
 # packages Conflict with each other.