feat: flip swap mechanism — Phase 2 (swap_sources.py rewrite)

Phase 2 of the MD-as-primary flip. Inverts swap_sources.py so it activates
RST overrides (rst-<stem>.rst → <stem>.rst, with the matching <stem>.md
excluded via _md_exclude.txt) for stems listed in docs/_rst_overrides.txt.

Changes:
- scripts/swap_sources.py: rewritten with inverted rename direction and
  renamed runtime artifacts (_rst_override_state.json, _md_exclude.txt).
  CLI flags --swap/--restore/--dry-run/--status kept for compatibility with
  the Makefile and Read the Docs config.
- docs/conf.py: clean up the runtime-artifact references that Phase 1 left
  pointing at the old _swap_state.json and _swap_exclude.txt names.
- scripts/import_myst.py and tests/test_import_myst.py deleted; obsolete
  after the flip (MD is canonical, no separate import workflow needed).
- tests/test_swap_sources.py: rewritten for the new semantics. All 10 tests
  pass under pytest.

Smoke-tested end-to-end on a real worktree page (quick-start): adding the
stem to _rst_overrides.txt, --dry-run, --swap, --status, --restore, all
behave correctly. State JSON has version 2 (bumped from 1 to surface the
incompatibility on rollback if old state lingers).

Phase 3 will verify Makefile, .readthedocs.yml, docs/_ext/vyos.py don't
reference any of the old names, then mark the PR ready-for-review.

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