chore: complete v1.1 milestone — Custom Sound Mappings

Archive roadmap and requirements to milestones/, update PROJECT.md
with shipped state, collapse ROADMAP.md, update retrospective.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -2,9 +2,9 @@
 gsd_state_version: 1.0
 milestone: v1.1
 milestone_name: Custom Sound Mappings
-status: executing
-stopped_at: Completed 07-02-PLAN.md
-last_updated: "2026-03-26T20:55:57.847Z"
+status: milestone_complete
+stopped_at: v1.1 milestone shipped
+last_updated: "2026-03-26T21:02:36.710Z"
 last_activity: 2026-03-26
 progress:
   total_phases: 3
@@ -21,13 +21,13 @@ progress:
 See: .planning/PROJECT.md (updated 2026-03-26)
 
 **Core value:** Network traffic patterns are instantly recognizable as distinct sounds — a ping sounds different from HTTPS noise, which sounds different from a port scan.
-**Current focus:** Phase 07 — custom-rules-and-print-config
+**Current focus:** Planning next milestone
 
 ## Current Position
 
-Phase: 07
-Plan: Not started
-Status: Ready to execute
+Phase: All v1.1 phases complete
+Plan: N/A
+Status: Milestone v1.1 shipped — ready for next milestone
 Last activity: 2026-03-26
 
 Progress: [░░░░░░░░░░] 0%