Level 18.6 Docs Cleanup (Overlay Slice)

- Classified overlay docs
- Consolidated duplicates
- Removed move-only artifacts
- Aligned to feature-based structure

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -2,10 +2,11 @@ MODEL: GPT-5.3-codex
 REASONING: high
 
 COMMAND:
-- Inspect overlay CSS only
-- Flatten CSS structure
-- Replace redundant styles with shared classes
-- Validate rendering + tests
+- Scan overlay-related docs only
+- Classify into buckets
+- Consolidate duplicates
+- Remove move-only docs AFTER validation
+- Output cleaned structure
 
 Output:
-<project folder>/tmp/BUILD_PR_LEVEL_18_5_CSS_UI_NORMALIZATION_OVERLAY_SLICE.zip
+<project folder>/tmp/BUILD_PR_LEVEL_18_6_DOCS_SYSTEM_CLEANUP_OVERLAY_SLICE.zip

docs/dev/COMMIT_COMMENT.txt

@@ -1,5 +1,6 @@
-Level 18.5 CSS/UI Normalization (Overlay Slice)
+Level 18.6 Docs Cleanup (Overlay Slice)
 
-- Flattened CSS layers
-- Removed redundant styles
-- Aligned UI classes to shared system
+- Classified overlay docs
+- Consolidated duplicates
+- Removed move-only artifacts
+- Aligned to feature-based structure

docs/dev/reports/overlay/MOVE_CLEANUP_MANIFEST_LEVEL_18_6.md

@@ -0,0 +1,28 @@
+# Level 18.6 Overlay Docs Move Cleanup Manifest
+
+Scope: move-only cleanup for overlay reports after content-preservation validation.
+
+## Moved Paths
+- `docs/dev/reports/BUILD_PR_LEVEL_17_59_DEBUG_OVERLAY_PROMOTE_BASELINE_report.md`
+  -> `docs/dev/reports/overlay/level-17/BUILD_PR_LEVEL_17_59_DEBUG_OVERLAY_PROMOTE_BASELINE_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_17_61_OVERLAY_SYSTEM_VALIDATION_SWEEP.md`
+  -> `docs/dev/reports/overlay/level-17/BUILD_PR_LEVEL_17_61_OVERLAY_SYSTEM_VALIDATION_SWEEP.md`
+- `docs/dev/reports/LEVEL17_OVERLAY_VALIDATION_SWEEP_2026-04-16.txt`
+  -> `docs/dev/reports/overlay/level-17/LEVEL17_OVERLAY_VALIDATION_SWEEP_2026-04-16.txt`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_1_OVERLAY_SYSTEM_EXPANSION_FRAMEWORK_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_1_OVERLAY_SYSTEM_EXPANSION_FRAMEWORK_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_2_OVERLAY_GAMEPLAY_RUNTIME_INTEGRATION_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_2_OVERLAY_GAMEPLAY_RUNTIME_INTEGRATION_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_3_OVERLAY_INTERACTION_CONTROLS_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_3_OVERLAY_INTERACTION_CONTROLS_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_4_OVERLAY_FOCUS_AND_INPUT_PRIORITY_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_4_OVERLAY_FOCUS_AND_INPUT_PRIORITY_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_5_OVERLAY_INPUT_EDGE_CASES_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_5_OVERLAY_INPUT_EDGE_CASES_report.md`
+- `docs/dev/reports/BUILD_PR_LEVEL_19_6_OVERLAY_MULTI_LAYER_COMPOSITION_report.md`
+  -> `docs/dev/reports/overlay/level-19/BUILD_PR_LEVEL_19_6_OVERLAY_MULTI_LAYER_COMPOSITION_report.md`
+
+## Validation
+- All 9 move pairs were verified against `HEAD` content.
+- Validation result: `validated_text_pairs 9`.
+- No content edits were made to moved files.

docs/dev/reports/overlay/README.md

@@ -0,0 +1,13 @@
+# Overlay Reports Structure
+
+This folder contains consolidated overlay reports grouped by phase to reduce duplicate top-level report clutter.
+
+## Layout
+- `docs/dev/reports/overlay/level-17`
+  - baseline promotion and validation sweep reports
+- `docs/dev/reports/overlay/level-19`
+  - runtime expansion, interaction, priority, edge-case, and composition reports
+
+## Move Validation
+- All moved files were hash-validated before old paths were removed.
+- No report content was modified during consolidation.

docs/dev/reports/overlay/STRUCTURE_LEVEL_18_6.txt

@@ -0,0 +1,14 @@
+docs/dev/reports/overlay
+  level-17/
+    BUILD_PR_LEVEL_17_59_DEBUG_OVERLAY_PROMOTE_BASELINE_report.md
+    BUILD_PR_LEVEL_17_61_OVERLAY_SYSTEM_VALIDATION_SWEEP.md
+    LEVEL17_OVERLAY_VALIDATION_SWEEP_2026-04-16.txt
+  level-19/
+    BUILD_PR_LEVEL_19_1_OVERLAY_SYSTEM_EXPANSION_FRAMEWORK_report.md
+    BUILD_PR_LEVEL_19_2_OVERLAY_GAMEPLAY_RUNTIME_INTEGRATION_report.md
+    BUILD_PR_LEVEL_19_3_OVERLAY_INTERACTION_CONTROLS_report.md
+    BUILD_PR_LEVEL_19_4_OVERLAY_FOCUS_AND_INPUT_PRIORITY_report.md
+    BUILD_PR_LEVEL_19_5_OVERLAY_INPUT_EDGE_CASES_report.md
+    BUILD_PR_LEVEL_19_6_OVERLAY_MULTI_LAYER_COMPOSITION_report.md
+  MOVE_CLEANUP_MANIFEST_LEVEL_18_6.md
+  README.md