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)

2 files changed, 148 insertions, 0 deletions

diff --git a/docs/introducing/md-about.md b/docs/introducing/md-about.md
new file mode 100644
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@@ -0,0 +1,21 @@
+(about)=
+
+# About
+
+VyOS is an open-source network operating system that provides a single unified
+CLI and API to manage routing protocols, firewall and NAT, QoS, load balancing,
+DHCP and DNS servers, and many other features.
+
+VyOS runs on a wide variety of commodity hardware, virtual machines, and
+multiple cloud environments.
+
+We provide a dedicated user guide for each major
+VyOS release that receives long-term support (LTS). We maintain multiple user
+guide versions, all hosted at <https://docs.vyos.io>.
+To switch between versions, select the appropriate version in the bottom-right
+corner.
+
+VyOS CLI syntax may vary between major and sometimes minor releases. Always
+refer to the documentation matching your current running installation. If
+a change in the CLI is required, VyOS provides a migration script to handle
+the syntax adjustments. No user action is required.
diff --git a/docs/introducing/md-history.md b/docs/introducing/md-history.md
new file mode 100644
index 00000000..190ee20c
--- /dev/null
+++ b/docs/introducing/md-history.md
@@ -0,0 +1,127 @@
+(history)=
+
+# History
+
+## In the beginning...
+
+There was a network operating system based on Debian GNU/Linux, called
+Vyatta. :sup:`\*` Introduced in 2006, it served as a great free-software alternative
+to proprietary products. Vyatta came in two editions: Vyatta Core
+(formerly known as Vyatta Community Edition), which was free software, and
+Vyatta Subscription Edition, which included proprietary features and was
+available only to paying customers.
+
+Brocade Communications Systems acquired Vyatta in 2012. Shortly after, Brocade
+renamed Vyatta Subscription Edition to Brocade vRouter, discontinued Vyatta
+Core, and shut down the community forum without notice. The bug tracker and Git
+repositories were closed the following year.
+
+By the time Brocade acquired Vyatta, the development of Vyatta Core had
+already stagnated. The focus had shifted to Vyatta Subscription Edition,
+where core components were replaced with proprietary software. As a result,
+Vyatta Core received fewer new features, and some of those added faced issues.
+
+In 2013, shortly after Vyatta Core was discontinued, the community forked its
+final version (6.6R1) to create the VyOS project. In 2014, the maintainers
+established a company to fund VyOS development through technical support,
+consulting services, and LTS release access subscriptions. The company was
+originally named Sentrium and was later reorganized under the VyOS brand.
+
+## Major releases
+
+VyOS originally named its major versions after elements by atomic number.
+Beginning with version 1.2, this naming scheme was changed. It now uses the
+Latin names of constellations recognized by the International Astronomical
+Union ([IAU](https://en.wikipedia.org/wiki/IAU_designated_constellations_by_area)),
+ordered by their solid angle area, beginning with the smallest.
+
+### Hydrogen (1.0)
+
+Released just in time for the holidays on 22 December 2013, Hydrogen was
+the first major VyOS release. It fixed features that were broken in
+Vyatta Core 6.6, such as IPv4 BGP peer groups and DHCPv6 relay, and
+introduced command scripting, a task scheduler, and web proxy LDAP
+authentication.
+
+### Helium (1.1)
+
+Helium, released on 9 October 2014, marked the first anniversary of the
+VyOS Project. The release introduced an event handler, L2TPv3 support,
+802.1ad (QinQ), and IGMP proxy, as well as experimental support for VXLAN
+and DMVPN. Notably, DMVPN remained non-functional in Vyatta Core due to its
+reliance on a proprietary NHRP implementation.
+
+### Crux (1.2)
+
+Crux (the Southern Cross) was released on 28 January 2019 and marked a
+departure from legacy Vyatta codebase and the start of the migration from
+Perl to Python as the primary language. The underlying base system was
+upgraded from Debian 6 (Squeeze) to Debian 8 (Jessie).
+
+Crux introduced many new features, some of the most noteworthy are:
+an mDNS repeater, a broadcast relay, a high-performance PPPoE server,
+an HFSC scheduler, and support for Wireguard, unicast VRRP, RPKI for BGP,
+and fully 802.1ad-compliant QinQ ethertype. The telnet server and support
+for P2P filtering were removed.
+
+Crux was the first VyOS release to feature a modular image build system.
+CLI definitions were written using an XML syntax automatically checked
+against a schema at build time. Python APIs were introduced for command
+scripting and configuration migration. New Perl code and old-style (non-XML)
+command definition were no longer accepted from that point.
+
+Crux reached the end of support in 2023.
+
+### Equuleus (1.3)
+
+Equuleus (the Little Horse) was a long-term support version released
+on 21 December 2021, just in time for the winter holidays.
+
+Equuleus brought many long-awaited features, most notably an SSTP VPN
+server, an IPoE server, an OpenConnect VPN server, and a serial console
+server. It also introduced reworked support for WWAN interfaces, support
+for GENEVE and MACSec interfaces, VRF, IS-IS routing, and preliminary support
+for MPLS and LDP.
+
+Equuleus reached the end of support in 2025.
+
+### Sagitta (1.4)
+
+Sagitta (the Arrow), the current LTS release, became generally available on
+4 June 2024. Its development began in late 2021 and focused on eliminating
+remaining legacy components and reworking core subsystems.
+
+The transition to XML-defined command definitions and script refactoring with
+separate verify, update, and apply stages were completed. The firewall
+subsystem was rebuilt on nftables, introducing interface-independent rulesets
+and the reimplemented zone-based firewall model. The PKI subsystem was
+redesigned to manage cryptographic material directly within the configuration
+file.
+
+Sagitta introduced rollback without reboot, support for Babel and PIM6 routing
+protocols, failover routes, segment routing, NAT64, an IKEv2 remote-access VPN
+server, Zabbix monitoring, HTTP load balancing, and configuration
+synchronization using the HTTP API.
+
+The underlying base system was upgraded to Debian 12 (Bookworm).
+
+### Circinus (1.5)
+
+Circinus (the Drawing Compass) is the codename for the upcoming development
+branch. VyOS 1.5 Circinus has not been released yet.
+
+## A note on copyright
+
+Unlike Vyatta, VyOS has never had closed-source code and never will.
+The only proprietary material in VyOS is non-code assets, such as
+graphics and the trademark "VyOS". :sup:`†`
+
+Note that we do not provide support for images distributed by a third party.
+See the
+[artwork license](https://github.com/vyos/vyos-build/blob/current/LICENSE.artwork)
+and the end-user license agreement at `/usr/share/vyos/EULA` in
+any pre-built image for more information.
+
+[\*] From the Sanskrit adjective "Vyātta" (व्यात्त), meaning opened.
+
+[†] This is similar to how Linus Torvalds owns the Linux trademark.