docs(12-03): complete cloud storage scanners plan

- SUMMARY.md with 4 cloud scanner sources (S3, GCS, Azure Blob, DO Spaces)
- STATE.md, ROADMAP.md, REQUIREMENTS.md updated

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: completed
-stopped_at: Completed 11-03-PLAN.md
-last_updated: "2026-04-06T09:09:48.100Z"
+stopped_at: Completed 12-03-PLAN.md
+last_updated: "2026-04-06T09:26:54.085Z"
 last_activity: 2026-04-06
 progress:
   total_phases: 18
-  completed_phases: 11
-  total_plans: 65
-  completed_plans: 66
+  completed_phases: 10
+  total_plans: 64
+  completed_plans: 67
   percent: 20
 ---
 
@@ -91,6 +91,7 @@ Progress: [██░░░░░░░░] 20%
 | Phase 10 P09 | 12min | 2 tasks | 5 files |
 | Phase 11 P03 | 6min | 2 tasks | 4 files |
 | Phase 11 P01 | 3min | 2 tasks | 11 files |
+| Phase 12 P03 | 4min | 2 tasks | 8 files |
 
 ## Accumulated Context
 
@@ -131,6 +132,7 @@ Recent decisions affecting current work:
 - [Phase 11]: RegisterAll extended to 18 sources (10 Phase 10 + 8 Phase 11); paste sources use BaseURL prefix in integration test to avoid /search path collision
 - [Phase 11]: Integration test uses injected test platforms for PasteSites (same pattern as SandboxesSource)
 - [Phase 11]: All five search sources use dork query format to focus on paste/code hosting leak sites
+- [Phase 12]: Cloud storage scanners use provider Name (not Keywords) for bucket name generation; HEAD probe before GET listing
 
 ### Pending Todos
 
@@ -145,6 +147,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-04-06T09:07:51.980Z
-Stopped at: Completed 11-03-PLAN.md
+Last session: 2026-04-06T09:26:54.081Z
+Stopped at: Completed 12-03-PLAN.md
 Resume file: None