chore: archive v1.2 milestone — Extended Protocol Coverage

35 traffic classes across 9 protocol families shipped. Archives
ROADMAP, REQUIREMENTS, and phase directories to milestones/v1.2-*.
Updates README with new protocol families, sound design table,
and [groups] TOML config documentation.

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

.planning/MILESTONES.md

@@ -1,5 +1,20 @@
 # Milestones
 
+## v1.2 Extended Protocol Coverage (Shipped: 2026-03-27)
+
+**Phases completed:** 4 phases, 7 plans, 14 tasks
+
+**Key accomplishments:**
+
+- Removed stale constants and future-proofed test bounds (Nyquist-based validation) to unblock all v1.2 work
+- Rebalanced all ClassFreqConfigs to major-second ladder in family frequency bands (65-3250 Hz) with Group field on FreqConfig
+- Added 21 new TrafficClass constants and 30 port-matching rules across 7 protocol families (Mail, File Transfer, Remote Access, Database, Discovery, VoIP, Infrastructure)
+- Full classification test coverage: 28 new subtests covering all new port/protocol/transport combinations
+- Added 21 ClassFreqConfigs entries with family-coherent sound design (shared waveform and frequency register per group)
+- Group-ordered `--print-config` output with section headers and `[groups]` TOML support for user-defined protocol-to-group reassignment
+
+---
+
 ## v1.1 Custom Sound Mappings (Shipped: 2026-03-26)
 
 **Phases completed:** 3 phases, 6 plans, 3 tasks