docs(phase-04): evolve PROJECT.md after phase completion

.planning/PROJECT.md

@@ -17,9 +17,14 @@ Network traffic patterns are instantly recognizable as distinct sounds — a pin
 - [x] Aggregate traffic into time windows to drive amplitude and tonal evolution — Validated in Phase 1
 - [x] CLI interface with flags for interface selection and output file path — Validated in Phase 1 (interface flags; output flag in Phase 2)
 
+### Validated in Phase 4
+
+- [x] BPF capture filter — users can scope live capture with tcpdump-syntax expressions — Validated in Phase 4
+- [x] Offline pcap file input — users can sonify historical pcap files without live capture — Validated in Phase 4
+
 ### Active
 
-(None — all requirements validated through Phase 3)
+(None — all requirements validated through Phase 4)
 
 ### Validated in Phase 3
 
@@ -67,7 +72,7 @@ Network traffic patterns are instantly recognizable as distinct sounds — a pin
 
 This document evolves at phase transitions and milestone boundaries.
 
-Last updated: 2026-03-26 — Phase 2 (Audio Synthesis Engine) complete.
+Last updated: 2026-03-26 — Phase 4 (Power User Features) complete. All v1.0 milestone phases delivered.
 
 **After each phase transition** (via `/gsd:transition`):
 1. Requirements invalidated? → Move to Out of Scope with reason
@@ -83,4 +88,4 @@ Last updated: 2026-03-26 — Phase 2 (Audio Synthesis Engine) complete.
 4. Update Context with current state
 
 ---
-*Last updated: 2026-03-25 after Phase 1 completion*
+*Last updated: 2026-03-26 after Phase 4 completion*