BUNDLEFIX-053: bundle.yaml to full 3-unit HA (D-121); reverse BUNDLEFIX-002 vault de-HA ...

Reverses the D-009/BUNDLEFIX-002/003 decorative-single-unit posture to real 3-unit HA per
operator ruling 2026-08-05 ("superseded the HA removal from all items ... stand up all
remaining HA apps ... HA blocks sign off"; "testing as if Roosevelt"). Executes adopted
D-121 incl. its (v-a) vault sub-ruling.

bundle.yaml:
- num_units 1->3 + to:[lxd:0,1,2] on 14 HA apps (keystone glance nova-cc placement
  neutron-api cinder ceph-radosgw dashboard octavia barbican magnum designate rabbitmq vault)
- hacluster cluster_count 1->3 x12
- vault-hacluster (cluster_count:3) + [vault:ha, vault-hacluster:ha] uncommented -- the
  BUNDLEFIX-002 reversal (D-121 (v-a): vault MySQL-backed HA)
- rabbitmq min-cluster-size:3 (D-009 amendment)
- governing comments reconciled (D-009/BUNDLEFIX-002/003 -> D-121 built)
overlays unchanged (VIPs already set).

Every change verified against charm/juju docs or the deployed charm (not assumed):
hacluster cluster_count default 3; rabbitmq min-cluster-size; vault ha endpoint=metal-internal
like keystone; vault MySQL-backend HA per HashiCorp docs (ha_enabled+lock_table). Validated:
provider-bundle-check.py --dc vr1-dc0 PASS (13 hacluster subs cluster_count==num_units; 13
principals carry a VIP; 109 relations well-formed); repo-lint 0 fail.

Live: Wave 1 (8 apps) scaled to 3-unit HA (see CURRENT-STATE + changelog). Waves 2-4 and the
post-wave bundle/overlay reconciliation (pinned task) remain. Body:
docs/changelog-20260805-d121-ha-scaleup.md. Status in docs/CURRENT-STATE.md ONLY.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fg98z7QyzwYUs8fsWCn728