docs(install): stitch the README → template first-run handoff — item 6 complete

Slice (c), the last of the docs review: the install/first-run story
read end to end against the tree. Facts held (mkFlake args match the
table, disko's @snapshots + hibernation swapfile, .#default/.#me
naming); the one seam — README §3 never pointed the manual path at the
template README's first-run steps — got a connective paragraph. Item 6
deleted from BACKLOG; ROADMAP § Full docs review flipped to ✓.

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

agent/BACKLOG.md

@@ -22,22 +22,7 @@ next, in what order*.
 
 ## NOW
 
-### 6. Full docs review & restructure — sliced, one slice per iteration
-ROADMAP § Full docs review. Done: the roadmap/backlog split (this file);
-slice (a) option-surface reconcile — README tables fixed (9 gaps) and
-the diff made permanent as the `option-docs` flake check (eval-walked
-surface vs tables, catches stale rows too); slice (b) drift pass over
-docs/OVERRIDES.md, docs/TESTING.md, templates/downstream/README.md —
-every factual claim spot-checked against the tree, all held; fixed the
-two gaps (OVERRIDES now routes to `nomarchy.monitors`; TESTING §1 lists
-the shell-syntax check its CI § claimed); slice (d) recovery runbook —
-docs/RECOVERY.md (theme/HM generations → greetd journals → boot an older
-generation → snapper restore/rollback → nixos-enter), linked from the
-README tree + §5. Remaining:
-- **(c) install/first-run story** read end to end (README install §§ +
-  template README as one narrative; fix the seams) — the last slice.
-Site-vs-markdown is a Decision (below). **Verify:** V0; (c) against the
-live tree, not memory.
+*(empty — NEXT's top item is the queue head)*
 
 ## NEXT