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, 50 insertions, 0 deletions

diff --git a/docs/configuration/system/md-index.md b/docs/configuration/system/md-index.md
new file mode 100644
index 00000000..e0b8a5a1
--- /dev/null
+++ b/docs/configuration/system/md-index.md
@@ -0,0 +1,34 @@
+# System
+
+```{toctree}
+:includehidden: true
+:maxdepth: 1
+
+acceleration
+conntrack
+console
+flow-accounting
+frr
+host-name
+ip
+ipv6
+lcd
+login
+name-server
+option
+proxy
+sflow
+syslog
+sysctl
+task-scheduler
+time-zone
+updates
+watchdog
+```
+
+```{toctree}
+:includehidden: true
+:maxdepth: 1
+
+default-route
+```
diff --git a/docs/configuration/system/md-sysctl.md b/docs/configuration/system/md-sysctl.md
new file mode 100644
index 00000000..90434fb2
--- /dev/null
+++ b/docs/configuration/system/md-sysctl.md
@@ -0,0 +1,16 @@
+(sysctl)=
+
+# Sysctl
+
+:::{note}
+This page is a stub and needs expansion. Contributions
+welcome via the [VyOS documentation repository](https://github.com/vyos/vyos-documentation).
+:::
+
+This chapter describes how to configure kernel parameters at runtime.
+
+`sysctl` is used to modify kernel parameters at runtime. The parameters
+available are those listed under /proc/sys/.
+
+```{cfgcmd} set system sysctl parameter \<parameter\> value \<value\>
+```
\ No newline at end of file