feat(ansible): idempotent role-based host config for both production VMs

common/firewall/docker-tls/platform/lab-host/monitoring-agent/backup roles,
orchestrated by site.yml with the ordering that matters (firewall/TLS land
before the services that depend on them). Ansible Vault for secrets, no new
tool introduced for this project's modest secret surface. Explicit
dev/staging/production environment separation, no secrets committed
(.gitignore covers vault plaintext, TLS keys, Terraform state, *.env).

Validated: ansible-playbook --syntax-check clean.

infra/environments/production/provisioner-config/resource-policy.yaml

@@ -0,0 +1,25 @@
+# PRODUCTION OVERLAY — placeholder, deliberately unchanged from the Phase 1 dev defaults.
+# Do not hand-tune these before the real host exists (docs/CAPACITY_PLANNING.md, Phase 4 §25).
+# After the first real load test on rn-lab-host-01 (infra/scripts/loadtest/), replace this
+# comment block and the numbers below with actual measured values, then redeploy via the
+# `platform` Ansible role (idempotent — re-running just re-renders this file).
+#
+# Phase 1 resource policy — config-driven, not hard-coded (decision #4).
+# Target host class for planning is ~16 cores/32 threads, 128GB RAM, SSD/NVMe.
+
+default:
+  cpu_limit: 2.0          # vCPUs
+  mem_limit_mb: 4096
+  pids_limit: 512
+  storage_limit_mb: 8192  # only enforced if the host's Docker storage driver supports
+                           # --storage-opt size= (see known-limitations in the SOP)
+
+idle_threshold_minutes: 30       # past this: log a warning event only
+abandoned_threshold_minutes: 120 # past this: reaper destroys for real
+
+reaper_poll_interval_seconds: 60
+
+health_check:
+  path: /api/health
+  timeout_ms: 240000   # k3s cold start in a nested container can be slow — matches the
+                        # ~60-attempt wait already in scripts/entrypoint.sh