chore: complete v1.8.0 Quick Mode milestone

Archived:
- milestones/v1.8.0-ROADMAP.md
- milestones/v1.8.0-REQUIREMENTS.md

Deleted (fresh for next milestone):
- ROADMAP.md
- REQUIREMENTS.md

Updated:
- MILESTONES.md (new entry)
- PROJECT.md (requirements → Validated)
- STATE.md (reset for next milestone)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/STATE.md

@@ -2,19 +2,17 @@
 
 ## Project Reference
 
-See: .planning/PROJECT.md (updated 2025-01-19)
+See: .planning/PROJECT.md (updated 2026-01-19)
 
 **Core value:** Same guarantees, 50-70% fewer tokens for simple tasks
-**Current focus:** Phase 2 - Documentation
+**Current focus:** Planning next milestone
 
 ## Current Position
 
-Phase: 2 of 2 (Documentation)
-Plan: 1 of 1 in current phase
-Status: Phase complete
-Last activity: 2026-01-19 - Completed 02-01-PLAN.md
-
-Progress: [##########] 100%
+Phase: Ready for new milestone
+Plan: Not started
+Status: v1.8.0 shipped, ready for next milestone
+Last activity: 2026-01-19 — v1.8.0 Quick Mode milestone complete
 
 ## Performance Metrics
 
@@ -30,10 +28,6 @@ Progress: [##########] 100%
 | 1. Core Command | 2/2 | 4 min | 2 min |
 | 2. Documentation | 1/1 | 3 min | 3 min |
 
-**Recent Trend:**
-- Last 5 plans: 01-01 (1 min), 01-02 (3 min), 02-01 (3 min)
-- Trend: Stable
-
 *Updated after each plan completion*
 
 ## Quick Tasks Completed
@@ -47,26 +41,18 @@ Progress: [##########] 100%
 
 ### Decisions
 
-Decisions are logged in PROJECT.md Key Decisions table.
-Recent decisions affecting current work:
-
-- Quick task directory structure: `.planning/quick/NNN-slug/` (01-01)
-- Quick task validation: ROADMAP.md only, no phase status check (01-01)
-- Orchestration inline in command file, no separate workflow (01-02)
-- STATE.md Quick Tasks table created on first quick task (01-02)
-- Quick Mode section placement: after Execution in help.md (02-01)
-- README dual entry: How It Works section AND Utilities table (02-01)
+Key decisions logged in PROJECT.md Key Decisions table.
 
 ### Pending Todos
 
-None yet.
+- `/gsd:resume-work` decimal phase handling (deferred from v1.8.0)
 
 ### Blockers/Concerns
 
-None yet.
+None.
 
 ## Session Continuity
 
 Last session: 2026-01-19
-Stopped at: Completed quick task 002 (90s HTML command reference)
+Stopped at: v1.8.0 milestone complete
 Resume file: None