feat(agent): autonomous-loop infrastructure + roadmap rework

A git-tracked agent/ directory so AI agents can iterate on the distro
unattended (runner-agnostic: /loop, headless claude -p, or a fresh
manual session — all state lives in the checkout, per the distro's own
philosophy):

- LOOP.md — the iteration protocol: orient → pick one BACKLOG task →
  verify up the V0–V3 ladder → commit+push main → record. Safety rails
  (v1 untouchable, no force-push, no surprise lock bumps) and
  stop-and-escalate conditions.
- BACKLOG.md — the forward half of docs/ROADMAP.md reworked into a
  prioritized queue (5 NOW / 6 NEXT / LATER / PROPOSED / Decisions);
  ROADMAP.md stays the design/decision record + shipped log.
- GOALS.md — the four pillars (stable > reproducible/zero-hidden-state >
  effortless config > beautiful), quality bars, non-goals.
- CONVENTIONS.md — coding/design rules (in-flake state, menu placement,
  Waybar whole-swap parity, toggle-vs-package, no formatter).
- MEMORY.md — curated hard-won lessons (VM recipes, btrfs-assistant
  segfault watch, rofi/WirePlumber/hyprlock gotchas).
- HARDWARE-QUEUE.md — every pending V3 on-hardware check collected from
  the ROADMAP, with exact steps, split by machine.
- JOURNAL.md — append-only iteration log, seeded with this bootstrap.

Plus a root CLAUDE.md entry point and README/ROADMAP pointers.

Verified: V0 — docs-only; nix flake check --no-build green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/ROADMAP.md

@@ -5,6 +5,12 @@ Forward-looking plans, plus a running log of shipped fixes (the
 stays a focused entry point — what Nomarchy is, how to install it, and
 how to override it. Items marked ✓ are shipped.
 
+> **The live, prioritized queue now lives in [`agent/BACKLOG.md`](../agent/BACKLOG.md)**
+> (part of the autonomous-agent loop, `agent/LOOP.md`). This file remains
+> the detailed design/decision record and the shipped log — backlog items
+> reference it as "ROADMAP § <item>". When a backlog item ships, its
+> lasting design notes get a ✓ entry here.
+
 ## Roadmap
 - **Menu system** (apps launcher + theme switching + system actions), built
   on rofi 2.0 (native Wayland on 26.05) — its `.rasi` theme is baked from