Initialize Level 19 planning bootstrap

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -1,3 +1,3 @@
 MODEL: GPT-5.3-codex
 REASONING: high
-COMMAND: Perform Phase 18 completion gate validation and update roadmap status only, package to <project folder>/tmp/BUILD_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE.zip
+COMMAND: Prepare Level 19 planning structure and package to <project folder>/tmp/PLAN_PR_LEVEL_19_1_NEXT_PHASE_BOOTSTRAP.zip

docs/dev/COMMIT_COMMENT.txt

@@ -1,3 +1 @@
-Finalize Phase 18 completion gate confirming all systems, integrations, and validations are complete and stable
-
-PR: BUILD_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE
+Initialize Level 19 planning bootstrap

docs/dev/reports/validation_checklist.txt

@@ -1,3 +1,2 @@
-- [ ] all validations pass
-- [ ] roadmap updated
-- [ ] no regressions
+- [ ] plan created
+- [ ] no unintended changes

docs/pr/PLAN_PR_LEVEL_19_1_NEXT_PHASE_BOOTSTRAP.md

@@ -0,0 +1,36 @@
+# PLAN_PR_LEVEL_19_1_NEXT_PHASE_BOOTSTRAP
+
+## Purpose
+Prepare a docs-first Level 19 planning bootstrap as the next execution wrapper after the Phase 18 completion gate, without adding implementation scope.
+
+## Source of Truth
+- `docs/dev/roadmaps/MASTER_ROADMAP_HIGH_LEVEL.md` (Section: `## 18. Finalize engine`)
+- `docs/dev/roadmaps/phases.txt` (note: no formal Phase 19+ lane is currently defined)
+
+## Scope
+- define Level 19 planning objectives as dependency-ordered completion slices for remaining Section 18 checklist items
+- establish a minimal Level 19 execution-lane outline (`19.2+`) for follow-on BUILD docs
+- keep this PR planning-only (no engine/runtime/sample/tool implementation changes)
+
+## Level 19 Planning Objectives (Section-18 Continuity)
+1. close remaining engine-usage audit/migration items across `samples/` and `games/`
+2. finish structured classification/move recommendations for sample-like game entries
+3. complete docs bucket classification and arrangement plan
+4. define final cleanup sequence for move/rename-only docs removal after content verification
+5. lock final API/boundary/contract closure ordering into small, testable BUILD slices
+
+## Initial Level 19 Execution Lanes
+1. `19.2` Engine-Usage Audit Closeout Plan
+2. `19.3` Samples/Games Classification and Move Recommendation Plan
+3. `19.4` Docs Bucketing and Consolidation Plan
+4. `19.5` API/Boundary/Contract Lockdown Planning Gate
+
+## Out of Scope
+- no `src/`, `samples/`, `games/`, or `tools/` implementation edits
+- no roadmap checkbox status updates in this planning bootstrap
+- no broad repo refactors
+
+## Exit Criteria
+- Level 19 planning scope is documented and actionable
+- initial Level 19 lane structure is defined for follow-on BUILD docs
+- planning-only delta is ready for repo-structured packaging