feat: flip swap mechanism — MD as primary, RST as override (Phase 1)

This is the first of three phases inverting the per-page swap mechanism
so MD becomes the canonical primary and RST becomes the rare override.

Phase 1 — file renames + conf.py exclude_patterns flip only:
- Rename docs/**/md-<stem>.md to docs/**/<stem>.md (drop md- prefix)
  for all 254 stems previously listed in docs/_swap.txt
- Rename docs/**/<stem>.rst to docs/**/rst-<stem>.rst (add rst- prefix)
  for the same 254 stems
- Repurpose docs/_swap.txt as docs/_rst_overrides.txt; initially empty
  comment-only since no pages need the RST fallback right now
- conf.py exclude_patterns flipped: rst-*.rst is now excluded by default
  instead of md-*.md
- conf.py runtime-artifact references updated to _rst_override_state.json
  and _md_exclude.txt (Phase 2 will rewrite swap_sources.py to produce
  these names; for now no swap script runs because overrides list is empty)

Phase 2 (next commit on this branch) will rewrite scripts/swap_sources.py
with inverted rename direction, delete scripts/import_myst.py + tests, and
update tests/test_swap_sources.py for the new semantics.

Phase 3 will be the cleanup pass and ready-for-review flip.

Generated by robots https://vyos.io

1 files changed, 59 insertions, 0 deletions

diff --git a/docs/coverage.md b/docs/coverage.md
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+---
+lastproofread: '2025-11-14'
+---
+
+# Coverage
+
+Overview over all commands that are documented in the
+`.. cfgcmd::` or `.. opcmd::` directives.
+
+The build process takes all XML definition files
+from the [vyos-1x](https://github.com/vyos/vyos-1x) repository and a
+periodical export of all VyOS commands and extracts each leaf command, or
+executable command.
+The script compares only the fixed part of a command.
+All variables and values are removed and the string of the commands
+are compared.
+
+For example, take the following two commands:
+
+- documentation: `interfaces ethernet <interface> address
+      <address | dhcp | dhcpv6>`
+- xml: `interfaces ethernet <ethernet> address <address>`
+- VyOS: `interfaces ethernet <text> address <value>`
+
+**There are 3 kinds of issues with commands in the following tables:**
+
+`Not documented yet`
+
+- An XML command is not found in `.. cfgcmd::` or `.. opcmd::` directives.
+- The command should be documented.
+
+`Nothing found in XML Definitions`
+
+- `.. cfgcmd::` or `.. opcmd::` The command is not found in the XML
+  definition.
+- The command location may have changed in the XML definition, the feature
+  is no longer supported in VyOS, or there is a typo in the command.
+
+`Nothing found in VyOS`
+
+- `.. cfgcmd::` or `.. opcmd::` The command is not found in VyOS
+  documentation or the XML definition.
+- The command location may have changed in the XML definition, the feature
+  is no longer supported in VyOS, or there is a typo in the command.
+
+The final list of commands are shown in
+the following two tables:
+
+## Configuration Commands
+
+```{cfgcmdlist}
+:show-coverage:
+```
+
+## Operational Commands
+
+```{opcmdlist}
+:show-coverage:
+```
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