Merge "docs: add CI coverage matrix"

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diff --git a/doc/source/contributor/ci-matrix.csv b/doc/source/contributor/ci-matrix.csv
new file mode 100644
index 000000000..c49b72868
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+++ b/doc/source/contributor/ci-matrix.csv
@@ -0,0 +1,24 @@
+Scenario;Disabled;Voting;Tempest;Core;Upgrade;SLURP;Multinode;TLS;Ceph;Cinder;Octavia;Valkey;Notes

+AIO core;–;✅;✅;✅;✅;✅;–;✅;–;–;–;–;"Core OpenStack (Keystone/Glance/Neutron/Nova/Heat) with Horizon; RabbitMQ/MariaDB/Memcached; Fluentd."

+Bifrost;–;–;–;–;–;–;–;–;–;–;–;–;Bifrost baremetal provisioning standalone.

+Cells;–;✅;✅;–;✅;–;✅;–;–;–;–;–;"Nova Cells v2 + ProxySQL; Horizon/Heat on; dashboard sanity."

+Cephadm;–;✅;✅;✅;✅;✅;✅;✅;✅;–;✅;✅;"External Ceph (cinder/glance/nova) + RGW; RabbitMQ tuned."

+Container engine migration;❌;–;✅;✅;–;–;✅;✅;–;–;–;–;"Container engine migration playbook; Tempest smoke; currently disabled (failing)."

+Federation;–;–;✅;–;✅;–;✅;✅;–;–;–;–;Keystone federation behind httpd.

+HAProxy FQDN;–;–;✅;–;–;–;✅;✅;–;–;–;–;HAProxy VIP/FQDN handling.

+Ironic;–;–;✅;✅;–;–;–;–;–;–;–;–;"Ironic + Tenks; Prometheus on; DNSMasq/iSCSI helpers."

+IPv6;❌;–;✅;–;✅;–;–;–;–;–;–;–;"IPv6-only deployment; currently disabled (disk pressure)."

+Kayobe;–;–;–;–;–;–;–;–;–;–;–;–;Kayobe overcloud smoke (non-voting).

+KVM;–;–;–;✅;–;–;✅;–;–;–;–;–;Nested virt compute (KVM).

+Let's Encrypt;–;✅;✅;–;✅;–;✅;–;–;–;–;–;"Pebble ACME end-to-end, dashboard; DB/Rabbit TLS."

+Magnum;–;–;✅;–;–;–;–;–;–;–;–;–;Magnum + Designate + Trove.

+MariaDB;–;✅;–;✅;✅;–;✅;–;–;–;–;–;Galera + ProxySQL, Fluentd, HAProxy, Keepalived.

+Masakari;–;–;✅;–;–;–;–;–;–;–;–;✅;Masakari + Pacemaker.

+NFV;–;–;✅;–;✅;–;–;–;–;–;✅;✅;Tacker + Neutron SFC, Barbican, Mistral, Aodh.

+Octavia;–;–;✅;–;–;–;–;–;✅;✅;–;–;Octavia/Amphora.

+OpenBao;–;–;–;–;–;–;–;–;–;–;–;–;"OpenBao-backed password management (password round-trip only; no deploy)."

+OVN;–;✅;✅;✅;✅;–;✅;✅;–;✅;–;–;Neutron ML2/OVN + OVN Octavia provider.

+Prometheus + OpenSearch;–;–;–;✅;–;✅;✅;–;–;–;–;–;Fluentd, OpenSearch, Grafana, Prometheus, RabbitMQ/DB core.

+Skyline;❌;–;✅;–;–;✅;–;–;–;–;–;–;"Skyline dashboard; currently disabled (SSO issues)."

+Telemetry;–;–;✅;–;–;✅;–;–;–;–;✅;✅;Aodh, Ceilometer, Gnocchi.

+Zun;–;✅;✅;–;✅;✅;✅;✅;–;–;–;–;"Zun + Kuryr + Cinder LVM; etcd; dashboard."

diff --git a/doc/source/contributor/ci.rst b/doc/source/contributor/ci.rst
index 71f9e3032..0ffd7d498 100644
--- a/doc/source/contributor/ci.rst
+++ b/doc/source/contributor/ci.rst
@@ -28,3 +28,21 @@ consumes a large amount of logging resources.
 
 Please note that git usually strips lines beginning with `#` from the commit
 message. This can be avoided by preceding the string with a space.
+
+CI coverage matrix
+~~~~~~~~~~~~~~~~~~
+
+Zuul job templates live in ``zuul.d`` and are applied in
+``zuul.d/project.yaml``. Pipelines always run tox/python style+unit checks,
+docs/release builds, and requirements checks; the matrix below shows the
+scenario jobs in ``check``/``gate``.
+
+.. csv-table:: Scenario matrix
+   :header-rows: 1
+   :file: ci-matrix.csv
+   :widths: 12 7 7 7 7 7 7 7 7 7 7 7 7 12
+   :delim: ;
+
+Legend: ✅ = covered, ❌ = disabled, – = not covered. ``Core`` means the standard
+Keystone/Glance/Neutron/Nova/Heat stack is deployed; ``Tempest`` indicates
+smoke tests run; ``SLURP`` = Skip Level Upgrade Release Process.