docs(0133): MIGRATION.md + growth log placeholder + drift fix

- modules/data_table/MIGRATION.md: porting guide + release checklist 1.0.0-stable
- data_table.md: growth log entry commented for post-gate bump
- data_table.md: fix error_type Go remnant ("error_go_core" -> "") in C++ module
- cpp/CMakeLists.txt: SQLite3 optional dep for data_table_bench (cross-windows)
- agent_cleanup_worktree.go: !windows build tag (uses unix-only syscalls)
- dev/issues/0133-cpp-data-table-10m-rows.md: issue tracking

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cpp/CMakeLists.txt

@@ -543,7 +543,13 @@ if(EXISTS ${_KANBAN_CPP_DIR}/CMakeLists.txt)
 endif()
 
 # --- data_table_bench (lives in apps/, issue 0133) ---
+# Requires SQLite3 dev libs. Skip silently when not available (e.g. cross-windows build).
 set(_DATA_TABLE_BENCH_DIR ${CMAKE_SOURCE_DIR}/../apps/data_table_bench)
 if(EXISTS ${_DATA_TABLE_BENCH_DIR}/CMakeLists.txt)
-    add_subdirectory(${_DATA_TABLE_BENCH_DIR} ${CMAKE_BINARY_DIR}/apps/data_table_bench)
+    find_package(SQLite3 QUIET)
+    if(SQLite3_FOUND)
+        add_subdirectory(${_DATA_TABLE_BENCH_DIR} ${CMAKE_BINARY_DIR}/apps/data_table_bench)
+    else()
+        message(STATUS "Skipping data_table_bench (SQLite3 dev libs not found)")
+    endif()
 endif()