docs(plans): add s6-overlay supervision plan (v3)

Replace tini with s6-overlay as PID 1 in the Hermes Docker image so that
main hermes, the dashboard, and dynamically-created per-profile gateways
all run as supervised services. Includes container-boot reconciliation
(Task 4.0) so per-profile gateways survive docker restart.

Plan history:
- v1: 2026-05-07 — original design (subagent gateways scope)
- v2: 2026-05-18 — re-validated, scope narrowed to per-profile gateways,
  WindowsServiceManager added to protocol
- v3: 2026-05-21 — re-validated in docker_s6 worktree, install-method
  stamp preservation noted in Task 2.3, Task 4.0 added for container
  restart survival

12.5 engineering days estimated across 7 phases.
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Ben 2026-05-21 12:39:05 +10:00 committed by teknium1
parent 00ec0b617c
commit d36461d806
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