docs(agent): #128 — 14d prune for system and Home Manager gens

Same floor (keep current + ≥3 past); age window 14 days not 30; apply
independently to system and HM profiles.

agent/JOURNAL.md

@@ -20,12 +20,12 @@ Template:
 ---
 
 ## 2026-07-15 — File #128 generation auto-prune policy (no code)
-- **Task:** Bernardo: auto-clean NixOS gens older than 30 days but always
-  keep ≥3 past generations.
-- **Did:** NEXT **#128**. Policy restated; noted existing `nix.gc` weekly
-  `--delete-older-than 14d` has no min-generation floor.
+- **Task:** Bernardo: auto-clean gens older than N days but always keep
+  ≥3 past; include HM; prefer 14d over 30d.
+- **Did:** NEXT **#128** — system **and** Home Manager; **14 days** + keep
+  ≥3 past. Noted existing `nix.gc` weekly 14d has no min-generation floor.
 - **Verified:** V0 (docs/agent only).
-- **Pending:** implement when picked; optional HM gens scope.
+- **Pending:** implement when picked.
 - **Next suggestion:** implement #128, or human #115/#120.
 
 ## 2026-07-15 — #111 Recovery + #105 System IA + #110 retire Control Center