DOCFIX-167: bundle.yaml -- Designate reactivation + D-108 DR mechanism (gaps #6+14) ...

Adds designate/designate-bind/designate-mysql-router/designate-hacluster
(D-106, supersedes D-019) and cinder-backup/ceph-rbd-mirror (D-108) to
bundle.yaml -- the same file this repo's jumphost uses against the live
VR0/DC0 rehearsal cloud, edited with corresponding care. Every new charm's
relation/binding shape was checked against its real metadata.yaml, not
guessed: caught and fixed three mistakes this way during self-review
(designate's real endpoint is dnsaas, not public; cinder-backup is a
subordinate with no amqp relation; ceph-rbd-mirror needs ceph-local/
ceph-remote, not a single invented binding key). Corrected ceph-mon's
rbd-mirror binding from storage to replication. Documents, rather than
invents, that ceph-remote (the peer DC's ceph-mon) needs a cross-model
relation or the manual CLI flow -- D-104's per-DC-independent-controller
design means it can't be a same-bundle relation line. Deliberately does
NOT reactivate os-public-hostname in this shared bundle (pushed to a
proposed per-DC overlay instead). Bundle parses clean (56 apps, 108
relations); provider-bundle-check.py PASS, all invariants unaffected.
Not applied to any live model.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QrcJx8TUar7pYAvpGJw57A

DOCFIX-157/158/159: Stage 4/6/7 runbooks -- MAAS deploy, DR drill, Designate/COS/Magnum ...

Completes all seven Stage 1-7 DC-DC runbooks (tooling gap register item #9
CLOSED):
- Stage 4 (MAAS enlist/commission/deploy, per DC): adapts phase-00's
  validated single-rack sequence per DC. Mandates the $DC selector
  convention (DOCFIX-151) and honestly documents that lib_hosts_select_dc
  will keep failing until this stage's own enrollment populates real host
  data. Names 7 real multi-rack gaps rather than working around them.
- Stage 6 (DR wiring and failover drill): implements Section 8's
  failover/failback skeleton, one-way-then-two-way per D-108. Found three
  real bundle.yaml gaps (missing cinder-backup/ceph-rbd-mirror charms,
  wrong-plane rbd-mirror binding) and makes fixing them the runbook's own
  first gated step. Includes a negative-control drill before the real one.
- Stage 7 (Designate, COS, Magnum/CAPI): quotes the bundle's actual
  current "NO designate" text before describing the D-106 reversal;
  identifies the reversal also affects the bundle's separate
  os-public-hostname posture; leaves COS's mechanism as an operator
  decision rather than inventing one.

Four new tooling-gap-register items (#12-15) added for cross-cutting
findings this runbook-authoring pass surfaced. None of the seven runbooks
have been executed against real infrastructure yet -- prep-only session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QrcJx8TUar7pYAvpGJw57A