docs(05-02): complete icon upload and export UI plan

- Create 05-02-SUMMARY.md with full execution details
- Update STATE.md progress to 100%, add 4 key decisions, record metrics
- Update ROADMAP.md phase 5 status to Complete
- Mark requirements PKG-04 and PKG-05 complete

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: Completed 05-01-PLAN.md
-last_updated: "2026-04-10T13:06:29.301Z"
+stopped_at: Completed 05-02-PLAN.md
+last_updated: "2026-04-10T13:07:54.912Z"
 last_activity: "2026-04-10 — Plan 04-02 complete: uninstall/detect templates, render_uninstall/render_detect, 3 script API endpoints, 75 tests green"
 progress:
   total_phases: 5
-  completed_phases: 4
+  completed_phases: 5
   total_plans: 11
-  completed_plans: 10
+  completed_plans: 11
 ---
 
 ---
@@ -73,6 +73,7 @@ Progress: [█████████░] 89%
 | Phase 04-script-generation P01 | 2 | 1 tasks | 3 files |
 | Phase 04-script-generation P02 | 2 | 2 tasks | 6 files |
 | Phase 05-package-export P01 | 2 | 1 tasks | 3 files |
+| Phase 05-package-export P02 | 15 | 2 tasks | 9 files |
 
 ## Accumulated Context
 
@@ -108,6 +109,10 @@ Recent decisions affecting current work:
 - [Phase 05-package-export]: _get_printer_and_driver() copied (not imported) from scripts.py for module self-containment in packages.py
 - [Phase 05-package-export]: NinjaRMM ZIP uses DEFLATE compression with {printer_name}/install.ps1 + {printer_name}/drivers/* structure
 - [Phase 05-package-export]: intunewin endpoint uses TemporaryDirectory for auto-cleanup; driver ZIP existence validated before processing (422 if missing)
+- [Phase 05-package-export]: Pillow for PNG validation — format detection, dimension check, byte reading in one pass
+- [Phase 05-package-export]: Icons stored SHA256-addressed under DATA_DIR/icons — consistent with DRIVERS_DIR content-addressing pattern
+- [Phase 05-package-export]: Icon replace via delete-then-create — unique FK makes upsert awkward, delete first is simpler
+- [Phase 05-package-export]: Export/command sections conditionally shown when has_driver is true — avoids confusing broken links before driver assigned
 
 ### Pending Todos
 
@@ -120,6 +125,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-10T13:06:29.293Z
-Stopped at: Completed 05-01-PLAN.md
+Last session: 2026-04-10T13:07:54.905Z
+Stopped at: Completed 05-02-PLAN.md
 Resume file: None