orchestrator: reboot-resilience + session auto-resume + full session plan/tooling

Reboot survival for the Pi orchestrator host:
- systemd unit cc-ci-plan/systemd/cc-ci-loops.service (installed + enabled): on boot
  records the reboot, starts loops+watchdog (RESUME_PHASE=1), and resumes the
  orchestrator session.
- reboot-log.sh: boot_id-gated reboot record -> REBOOTS.md (manual restarts don't count).
- launch-orchestrator.sh: injects an AGENTS.md startup nudge so an auto-resumed
  orchestrator announces itself (PushNotification) + reports reboots.
- AGENTS.md: on-startup notify routine documented.

Plans/tooling accumulated this session:
- plan-phase1d (generic suite), 1e (harness corrections), phase4 (final review),
  sso-dep-testing, orchestrator-migration (parked), test-e2e-testme-acceptance.
- launch.sh: 1d/1e/2/2b/3/4 phase sequence, machine-docs-aware state resolution,
  limit-stall re-nudge, INBOX side-channel detection.
- plan.md §6.1/§7: artifact-layer isolation, INBOX, 5-min long-run polling, DEFERRED.
- prompts: isolation discipline + INBOX + pacing.
- .gitignore: harden (.sops/, cc-ci-secrets/, .claude/, *.tmp.*).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -10,3 +10,9 @@
 /cc-ci-adv/
 /.cc-ci-watch/
 /.cc-ci-logs/
+
+# More secrets / local state — NEVER commit
+/.sops/            # master recovery age key
+/cc-ci-secrets/    # separate sops-secrets repo, cloned in
+/.claude/          # local claude session/project state
+*.tmp.*            # editor temp files