docs: record the branch/release model + sanitize progress

Document the main=dev / v1=release-pointer model in flake.nix (where the
v1 ref is defined) and mark the repo-sanitize roadmap items shipped
(installer prune, option-table reconcile, settings untrack, branch
realignment).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/ROADMAP.md

@@ -148,14 +148,21 @@ how to override it. Items marked ✓ are shipped.
   cache. Remaining (optional): a session-level `SSH_AUTH_SOCK` export so GUI
   clients launched outside a shell also see the agent.
 - **Sanitize & organize the repo:** a housekeeping pass for consistency
-  and clarity. Candidate targets (scope still to be defined): prune
-  now-redundant config (e.g. the installer still writes
-  `console.useXkbConfig` / `boot.initrd.systemd.enable` into `system.nix`,
-  which are distro-wide defaults as of the LUKS-keymap fix); reconcile the
-  README option tables with the actual `nomarchy.*` surface; audit
-  comments/docs for drift against the code; and re-check that every file
-  still earns its place under the `modules`/`hosts`/`themes`/`pkgs`/`tools`
-  rule of thumb.
+  and clarity.
+  - ✓ pruned now-redundant config: the installer no longer writes
+    `console.useXkbConfig` / `boot.initrd.systemd.enable` into `system.nix`
+    (distro-wide defaults since the LUKS-keymap fix), nor the offline-pin
+    test fixture in `flake.nix`.
+  - ✓ reconciled the README option tables with the live `nomarchy.*`
+    surface (added keys/fastfetch/snapper/greeter.autoLogin).
+  - ✓ untracked `.claude/settings.local.json` (machine-local) + gitignored.
+  - ✓ **branch/release model:** `main` is the development default; `v1` is
+    the release pointer downstreams pin (`?ref=v1`), advanced to main once
+    a batch is tested — rolling, no tags. Brought `main` current (it was a
+    stale legacy-merge), and deleted the dead `refactor` / `wave/nixos-26.05`
+    branches (kept `legacy` for history). See the comment in `flake.nix`.
+  - Remaining (optional): re-check that every file still earns its place
+    under the `modules`/`hosts`/`themes`/`pkgs`/`tools` rule of thumb.
 - **Full docs review & restructure:** a dedicated pass over all the prose,
   not just the code-adjacent cleanup the repo-sanitize item covers. The
   README has grown to ~540 lines with a ~200-line roadmap inline — the