feat: activate 106 visual-validated canaries via swap

Imports 105 MD files (plus quick-start already present) from
origin/myst/current and adds them to docs/_swap.txt. The selection
is the BackstopJS visual-passers cohort: pages with <5% rendered
diff vs the live RST docs at docs.vyos.io/en/latest/, filtered to
those with an RST counterpart on current and no cmdincludemd usage
(template-format reconciliation pending).

Local sphinx-build with all 106 swapped: succeeded with 100
warnings (vs 95 baseline). The 5 new warnings are all undefined
cross-reference labels, not build failures:
- contributing/development.md (missing 'coding-guidelines')
- operation/upgrade-recovery.md (3 missing 'how_it_works' /
  'cancelling_recovery')
- vpp/configuration/dataplane/{buffers,memory,unix}.md (missing
  'vpp_config_dataplane_*' labels)

Source list: ~/.claude/projects/-Users-vybot-GitHub-vyos-documentation/docs/2026-04-29-myst-conversion-audit/visual-passers-under-5pct.txt
BackstopJS report: claude/gifted-hertz-74b9f9 worktree
(visual-compare/), 2026-04-23 vs vyos--1838.org.readthedocs.build.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 206 insertions, 0 deletions

diff --git a/docs/contributing/md-testing.md b/docs/contributing/md-testing.md
new file mode 100644
index 00000000..5e2371d6
--- /dev/null
+++ b/docs/contributing/md-testing.md
@@ -0,0 +1,206 @@
+---
+lastproofread: '2025-12-02'
+---
+
+(testing)=
+
+# Testing
+
+One of the major features introduced in VyOS 1.3 is an automated test
+framework. When you assemble an ISO image, several things can go wrong.
+VyOS uses this framework to detect issues before they cause downstream problems.
+
+This section describes how the automated testing process at VyOS works.
+
+## Smoketests
+
+Smoketests execute predefined VyOS CLI commands and check if the desired
+daemon or service configuration is rendered.
+
+When an ISO image is assembled by the [VyOS CI](https://ci.vyos.net), the `BUILD_SMOKETEST`
+parameter is enabled by default. This extends the ISO configuration line
+with the following packages:
+
+```python
+def CUSTOM_PACKAGES = ''
+  if (params.BUILD_SMOKETESTS)
+    CUSTOM_PACKAGES = '--custom-package vyos-1x-smoketest'
+```
+
+If you plan to build your own custom ISO image and want to use VyOS's
+smoketests, ensure that you have the `vyos-1x-smoketest` package installed.
+
+The `make test` command from the [vyos-build](https://github.com/vyos/vyos-build) repository launches a new
+QEMU instance, and the ISO image is first installed to the virtual hard disk.
+
+After the first boot into the newly installed system, the main Smoketest script
+is executed. It can be found at `/usr/bin/vyos-smoketest`.
+
+The script searches for executable test cases under
+`/usr/libexec/vyos/tests/smoke/cli/` and executes them one by one.
+
+:::{note}
+Smoketests will alter the system configuration. If you are logged
+in remotely, you may lose your connection to the system.
+:::
+
+:::{note}
+To enable smoketest debugging (print the CLI set commands used),
+run: `touch /tmp/vyos.smoketest.debug`.
+:::
+
+### Manual Smoketest Run
+
+Each test is contained in its own file, so you can execute a single Smoketest
+manually by running the Python test script.
+
+Example:
+
+```none
+vyos@vyos:~$ /usr/libexec/vyos/tests/smoke/cli/test_protocols_bgp.py
+test_bgp_01_simple (__main__.TestProtocolsBGP) ... ok
+test_bgp_02_neighbors (__main__.TestProtocolsBGP) ... ok
+test_bgp_03_peer_groups (__main__.TestProtocolsBGP) ... ok
+test_bgp_04_afi_ipv4 (__main__.TestProtocolsBGP) ... ok
+test_bgp_05_afi_ipv6 (__main__.TestProtocolsBGP) ... ok
+test_bgp_06_listen_range (__main__.TestProtocolsBGP) ... ok
+test_bgp_07_l2vpn_evpn (__main__.TestProtocolsBGP) ... ok
+test_bgp_08_zebra_route_map (__main__.TestProtocolsBGP) ... ok
+test_bgp_09_distance_and_flowspec (__main__.TestProtocolsBGP) ... ok
+test_bgp_10_vrf_simple (__main__.TestProtocolsBGP) ... ok
+test_bgp_11_confederation (__main__.TestProtocolsBGP) ... ok
+test_bgp_12_v6_link_local (__main__.TestProtocolsBGP) ... ok
+test_bgp_13_solo (__main__.TestProtocolsBGP) ... ok
+
+----------------------------------------------------------------------
+Ran 13 tests in 348.191s
+
+OK
+```
+
+### Interface-based tests
+
+Our smoketests not only test daemons and services, but also check if interface
+configuration works as expected. There is a common base class named
+`base_interfaces_test.py` that holds all the common code for interface tests.
+
+These common tests consist of:
+
+- Add one or more IP addresses
+
+- DHCP client and DHCPv6 prefix delegation
+
+- MTU size
+
+- IP and IPv6 options
+
+- Port description
+
+- Port disable
+
+- VLANs (QinQ and regular 802.1q)
+
+- ...
+
+:::{note}
+When you are working on interface configuration and want to test
+if the Smoketests pass, you would normally lose the remote SSH connection
+to your {abbr}`DUT (Device Under Test)`. To handle this, some interface-based
+tests can be called with an environment variable beforehand to limit the
+number of interfaces used in the test. By default, all interfaces (e.g., all
+Ethernet interfaces) are used.
+:::
+
+```none
+vyos@vyos:~$ TEST_ETH="eth1 eth2" /usr/libexec/vyos/tests/smoke/cli/test_interfaces_bonding.py
+test_add_multiple_ip_addresses (__main__.BondingInterfaceTest) ... ok
+test_add_single_ip_address (__main__.BondingInterfaceTest) ... ok
+test_bonding_hash_policy (__main__.BondingInterfaceTest) ... ok
+test_bonding_lacp_rate (__main__.BondingInterfaceTest) ... ok
+test_bonding_min_links (__main__.BondingInterfaceTest) ... ok
+test_bonding_remove_member (__main__.BondingInterfaceTest) ... ok
+test_dhcpv6_client_options (__main__.BondingInterfaceTest) ... ok
+test_dhcpv6pd_auto_sla_id (__main__.BondingInterfaceTest) ... ok
+test_dhcpv6pd_manual_sla_id (__main__.BondingInterfaceTest) ... ok
+test_interface_description (__main__.BondingInterfaceTest) ... ok
+test_interface_disable (__main__.BondingInterfaceTest) ... ok
+test_interface_ip_options (__main__.BondingInterfaceTest) ... ok
+test_interface_ipv6_options (__main__.BondingInterfaceTest) ... ok
+test_interface_mtu (__main__.BondingInterfaceTest) ... ok
+test_ipv6_link_local_address (__main__.BondingInterfaceTest) ... ok
+test_mtu_1200_no_ipv6_interface (__main__.BondingInterfaceTest) ... ok
+test_span_mirror (__main__.BondingInterfaceTest) ... ok
+test_vif_8021q_interfaces (__main__.BondingInterfaceTest) ... ok
+test_vif_8021q_lower_up_down (__main__.BondingInterfaceTest) ... ok
+test_vif_8021q_mtu_limits (__main__.BondingInterfaceTest) ... ok
+test_vif_8021q_qos_change (__main__.BondingInterfaceTest) ... ok
+test_vif_s_8021ad_vlan_interfaces (__main__.BondingInterfaceTest) ... ok
+test_vif_s_protocol_change (__main__.BondingInterfaceTest) ... ok
+
+----------------------------------------------------------------------
+Ran 23 tests in 244.694s
+
+OK
+```
+
+This will limit the `bond` interface test to use only `eth1` and `eth2`
+as member ports.
+
+## Config Load Tests
+
+The other part of our tests are called "config load tests." Config load tests
+sequentially load arbitrary configuration files to verify that configuration
+migration scripts work as designed and that a given set of functionality can
+still be loaded with a fresh VyOS ISO image.
+
+The configurations are all derived from production systems and can act as
+test cases or as references for enabling certain features. The configurations
+can be found here:
+<https://github.com/vyos/vyos-1x/tree/current/smoketest/configs>
+
+The entire test is controlled by the main wrapper script
+`/usr/bin/vyos-configtest`.
+It behaves in the same way as the main smoketest script. It scans the folder
+for potential configuration files and issues a `load` command for each file.
+
+### Manual config load test
+
+You do not have to load all configurations sequentially; you can also load
+individual test configurations manually.
+
+```none
+vyos@vyos:~$ configure
+load[edit]
+
+vyos@vyos# load /usr/libexec/vyos/tests/config/ospf-small
+Loading configuration from '/usr/libexec/vyos/tests/config/ospf-small'
+Load complete. Use 'commit' to make changes effective.
+[edit]
+vyos@vyos# compare
+[edit interfaces ethernet eth0]
+-hw-id 00:50:56:bf:c5:6d
+[edit interfaces ethernet eth1]
++duplex auto
+-hw-id 00:50:56:b3:38:c5
++speed auto
+[edit interfaces]
+-ethernet eth2 {
+-    hw-id 00:50:56:b3:9c:1d
+-}
+-vti vti1 {
+-    address 192.0.2.1/30
+-}
+...
+
+vyos@vyos# commit
+vyos@vyos#
+```
+
+:::{note}
+Some configurations have preconditions that must be met. These most
+likely include generation of cryptographic keys before the config can be
+applied; otherwise, you will get a commit error. If you are interested in
+how those preconditions are fulfilled, check the [vyos-build](https://github.com/vyos/vyos-build) repository and
+the `scripts/check-qemu-install` file.
+:::
+