feat(font+sys): 字库内存纪律(agent-215)+sysui接管launcher监管(agent-216)

215: meow_font.c 流式分块解码(gbk峰值40→23.5MB, 逐字节校验一致) + 多字体槽5→4+16MB驻留预算; 量化: gbk稳态驻留17.3MB vs common 4.2MB(OOM主因); meow_font.a→67113c03 meow_ui.a→223d5401
216: bootmenu让位(sysui在则start launcher让位, 不在则exec兜底) + S70预置launcher.conf enabled=1(+旧设备升级迁移); launcher崩溃可自动拉起; bootmenu 4441822d / S70 e435affc / S90 e0ace111
216注: S70早启动与选单共存为真机重点观察项

patch_v2/bootmenu/S90meow_bootmenu

@@ -8,10 +8,11 @@
 #   * M2: meow_bootmenu is launched with --fork, so:
 #       选 HibyOS -> bootmenu forks /usr/bin/hiby_player (最小启动契约),
 #                   parent becomes supervisor/热键守护, blocks rcS.
-#       选 MeowOS -> bootmenu exec /usr/bin/meow_launcherd (MeowOS 基础主屏),
-#                   blocks rcS.
-#     Either way rcS is blocked by S90 until整机重启/热键切换, so S92 (兜底 patch)
-#     is normally never reached; SSH was moved to S84 so it is already online.
+#       选 MeowOS -> launcher 生命周期已交 meow_sysui（S70 起）：sysui 在 → bootmenu
+#                   让 sysui 拉起 launcher 并让位退出（rcS 推进，S92 见 mode=meow 跳过
+#                   播放器）；sysui 不在 → bootmenu 照旧 exec /usr/bin/meow_launcherd（兜底）。
+#     HibyOS 模式 rcS 被 S90 阻塞；MeowOS（sysui 托管）rcS 推进到 S92（兜底 patch，mode=meow 跳过）。
+#     SSH was moved to S84 so it is already online.
 #   * rcS runs S??* (non-.sh) as fork-ed subprocesses, so `exec` here replaces
 #     ONLY this script's process.
 #   * 红线: 启动前清 /data/recovery_all、禁经 hiby_player.sh、禁 killall、